The short version of chelation fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2026-03-16. Anything still debated is marked as such rather than presented as settled.
Endogenous GHK occurs in blood plasma, saliva, and urine, and reported plasma concentrations decline with age in several studies. Researchers have proposed that the peptide acts as a copper carrier that delivers the metal to cells and to sites of injury. That transport role is a hypothesis supported by binding measurements and tissue-distribution data rather than a settled mechanism, and the peptide is generally described as a minor contributor to total plasma copper transport. Values reported in wound fluid and certain tissue extracts are higher than in circulating plasma.
The sequence carries three residues in the order glycine, histidine, lysine, which places a small, flexible chain around a single metal centre. Compared with larger copper-binding proteins, the complex is compact and its coordination chemistry can be reproduced with synthetic peptide in a laboratory. Published structural work agrees on the nitrogen donor set but differs in the exact geometry assigned under some conditions, so the arrangement is best treated as well characterised in outline rather than fixed in every detail.
Routine handling calls for minimizing freeze-thaw cycles and preparing solutions shortly before use. Glass or inert plastic containers reduce adsorption and metal leaching. Working stocks are often kept at 2–8 °C for short periods, while long-term reference material stays at −20 °C or below. Light protection is prudent because prolonged exposure may accelerate oxidation of the peptide. Documentation of lot number, concentration, and preparation date supports reproducibility in laboratory work.
Analytical verification typically combines reversed-phase high-performance liquid chromatography with ultraviolet-visible detection. The copper complex absorbs visible light near 600–630 nm, giving a characteristic blue signal. Mass spectrometry confirms molecular mass and can detect free peptide or mismatched copper stoichiometry. Copper content is often measured independently by inductively coupled plasma mass spectrometry or atomic absorption spectroscopy. Purity, counterion identity, and residual solvents are additional quality-control parameters that methods may address.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Copper(II)-tripeptide complex | One peptide ligand with one coordinated metal centre |
| Peptide sequence | Gly-His-Lys | Three residues written in one-letter notation |
| Free peptide mass | 340.4 g/mol | Metal-free GHK; the complex has a higher mass |
| Appearance | Blue to violet solid or solution | Colour originates from copper d orbital transitions |
| Storage | Desiccated, -20 °C, protected from light | Dry powder is more stable than dissolved material |
Aqueous solutions of GHK-Cu are less stable than the dry powder. The peptide backbone is vulnerable to hydrolysis at extreme pH, and copper can be stripped from the complex by strong chelating agents such as EDTA or citrate. Oxidising agents and high concentrations of ascorbic acid can reduce copper(II) and change the complex, which is one reason formulators often keep such ingredients in separate phases. How quickly these changes occur under real storage conditions depends on pH, buffer, temperature and packaging, and quantitative data on the subject are limited.
Dry material is normally held cold, commonly at -20 °C for long-term storage and 2 to 8 °C for working quantities, protected from light and moisture. Vials should be allowed to reach room temperature before opening so that condensation does not form on the powder. In liquid formulations the complex is generally kept near neutral to slightly acidic pH, because strongly alkaline conditions favour precipitation of copper hydroxide. Antioxidants or chelate-stabilising excipients are often added, though the specific approaches are proprietary and rarely published in detail.
The sequence now called GHK was first reported in the early 1970s after isolation from human plasma, where it was noted to influence liver cell behavior in laboratory preparations. Later work described a copper-binding form and its activity in fibroblast and wound-model experiments. Review articles frequently group the substance with other copper peptides. Concentrations in blood appear to fall with age in several small surveys, although the reason for this trend is not settled. Whether such a decline carries functional consequences remains an open question.
Published work on GHK-Cu concentrates largely on cell culture systems rather than whole organisms. Frequently used endpoints include collagen synthesis, expression of matrix metalloproteinases, and migration of fibroblasts. Some reports describe antioxidant behavior, while others stress delivery of copper into cells. These mechanisms are proposed rather than demonstrated, and the relative weight of each pathway is unclear. Human trials are few and generally small, so laboratory findings should not be read as confirmed clinical results.
GHK-Cu is a coordination complex formed between the tripeptide glycyl-L-histidyl-L-lysine and a copper(II) ion. The peptide backbone consists of glycine, histidine, and lysine joined in that order. Copper is held through the imidazole nitrogen of histidine and the alpha-amino group at the N-terminus, which together produce a square-planar arrangement around the metal center. The solid appears blue to violet, a color that originates from d-d electronic transitions within the copper coordination sphere. The complex is indexed under CAS number 89030-95-5.
Mechanistic accounts focus on how the complex delivers copper and how the released peptide interacts with the extracellular matrix. Copper is an essential cofactor for lysyl oxidase and other enzymes involved in collagen and elastin cross-linking, and GHK is one of several peptides able to carry the metal. Reported effects include altered gene expression in fibroblasts and changes in matrix metalloproteinase activity, although many of these findings come from cell culture rather than whole organisms. The relative contribution of the peptide backbone, the copper ion, and downstream copper metabolism is not fully resolved.
GHK-Cu is a coordination complex formed between the tripeptide glycyl-L-histidyl-lysine and a copper(II) ion. The peptide sequence is conventionally written as Gly-His-Lys, abbreviated GHK. Copper binds through the imidazole nitrogen of histidine, the alpha-amino group, and a deprotonated amide nitrogen, producing a square-planar geometry. The complex carries a net positive charge near physiological pH and is intensely blue in aqueous solution. The metal-free peptide is often written simply as GHK, while the copper-bound form is written GHK-Cu.
The compound was first isolated from human plasma by the biochemist Loren Pickart in 1973. Early work identified it as a factor that altered the behavior of cultured liver cells, and later studies linked it to connective tissue and wound-related processes. Reported plasma concentrations fall markedly between roughly age twenty and age sixty, a pattern that generated interest in copper peptide biology. Whether that decline has functional consequences remains an open question, because differences observed across age groups do not by themselves establish causation. Research interest later expanded into cosmetic and tissue-culture settings.
Published work on GHK-Cu is dominated by in vitro experiments and small animal studies. Human trials tend to be short and small, with endpoints such as skin appearance rather than clinical outcomes. Review articles often summarize the same underlying laboratory findings, which can make the evidence base look broader than it is. Several basic questions remain open: the concentration of the intact complex in human tissue, the route by which it crosses the skin barrier, and whether effects seen in culture produce measurable changes in people.
Laboratory studies describe GHK-Cu as a source of copper that cells can take up, with reported effects on collagen, elastin, and glycosaminoglycan synthesis in cultured fibroblasts. The peptide also appears in wound-repair research, where it is linked to the activity of matrix metalloproteinases and their inhibitors. These observations come largely from cell and animal models. How directly the complex controls any single pathway in intact human skin remains an open question, and reported effects depend on concentration, vehicle, and exposure time.
A microprotein (miP) is a small protein of about 100–150 amino acids or fewer encoded from a small open reading frame (sORF), also known as sORF-encoded protein (SEP). They are a class of protein with a single protein domain. They are related to multidomain proteins. Microproteins regulate larger multidomain proteins at the post-translational level. Microproteins are analogous to microRNAs (miRNAs) and heterodimerize with their targets causing dominant and negative effects. In animals and plants, microproteins influence many biological processes. Because of their dominant effects on their targets, microproteins are currently under study for use in biotechnology. There are several methods for microprotein study, such as ribosome profiling, mass spectrometry, and genetic screening. In humans, they are associated with genetic diseases and cancers, and are called peptideins.
Baricitinib, sold under the brand name Olumiant among others, is an immunomodulatory medication used for the treatment of rheumatoid arthritis, alopecia areata, and COVID-19. It acts as an inhibitor of janus kinase (JAK), blocking the subtypes JAK1 and JAK2. Baricitinib is approved for medical use in the European Union and in the United States.
== Interactions == CYP3A4 inhibitors can increase exposure to suvorexant while CYP3A4 inducers can decrease exposure to suvorexant. Combination of suvorexant with the strong CYP3A4 inhibitor ketoconazole increased suvorexant overall exposure by 2.79-fold and peak levels by about 1.25-fold, combination with the moderate CYP3A4 inhibitor diltiazem increased suvorexant overall exposure by 2.05-fold and peak levels by about 1.25-fold, and combination with the strong CYP3A4 inducer rifampin decreased suvorexant overall exposure by 88% and peak levels by about 65%. The elimination half-life of suvorexant (about 12 hours for suvorexant alone) was increased to 19.4 hours with ketoconazole and to 16.1 hours with diltiazem while it was decreased to 7.7 hours with rifampin. Concomitant use of suvorexant with strong CYP3A4 inhibitors is not recommended, while lower doses of suvorexant are recommended with moderate CYP3A4 inhibitors (5 mg starting dose and 10 mg maximum dose generally). The substantial decrease in suvorexant exposure with strong CYP3A4 inducers may result in loss of effectiveness. Suvorexant does not appear to have been assessed in combination with moderate CYP3A4 inducers (e.g., modafinil).
It had two taxiways and a 6,800-by-400-foot (2,070 by 120 m) runway. In June 1945, the 67th CB arrived to build a 35,000 man recreation center to be turned over to CBMU 608. In 1950, John C. Woods, who executed the Nazi war criminals convicted at the Nuremberg trials, died by accidental electrocution while stationed on Enewetak Atoll.
Sources: en.wikipedia.org
==== Amyotrophic lateral sclerosis ==== It has been shown that amyotrophic lateral sclerosis (ALS) is clearly linked to changes in glutamate signaling and glutathione levels; there is also an astrocytic component linked to the disease. All of these factors suggest that a dysfunction in system Xc- may contribute to ALS. It has been observed that an increase in the expression of Nrf2, a transcription factor for system Xc-, leads to a protective effect in mice with ALS symptoms.
Eddy stayed there for two years, from 1868 to 1870, teaching Wentworth with Quimby's unpublished essay, "Questions and Answers." She acknowledged that the manuscript was Quimby's, and spoke often of how she had promised to teach his healing method, which at the time she called Moral Science.
Calcinosis cutis is an uncommon condition marked by calcium buildup in the skin and subcutaneous tissues. Calcinosis cutis can range in intensity from little nodules in one area of the body to huge, crippling lesions affecting a vast portion of the body. Five kinds of the condition are typically distinguished: calciphylaxis, idiopathic calcification, iatrogenic calcification, dystrophic calcification, and metastatic calcification. Tumors, inflammation, varicose veins, infections, connective tissue disease, hyperphosphatemia, and hypercalcemia can all lead to calcinosis. Systemic sclerosis is linked to calcineuris cutis. Calcinosis is seen in Limited Cutaneous Systemic Sclerosis, also known as CREST syndrome (the "C" in CREST).
Sources: en.wikipedia.org
=== Multi-Stream Transport (MST) === Multi-Stream Transport is a feature first introduced in the DisplayPort 1.2 standard. It allows multiple independent displays to be driven from a single DP port on the source devices by multiplexing several video streams into a single stream and sending it to a branch device, which demultiplexes the signal into the original streams. Branch devices are commonly found in the form of an MST hub, which plugs into a single DP input port and provides multiple outputs, but it can also be implemented on a display internally to provide a DP output port for daisy-chaining, effectively embedding a 2-port MST hub inside the display. Theoretically, up to 63 displays can be supported, but the combined data rate requirements of all the displays cannot exceed the limits of a single DP port (17.28 Gbit/s for a DP 1.2 port, or 25.92 Gbit/s for a DP 1.3/1.4 port). In addition, the maximum number of links between the source and any device (i.e. the maximum length of a daisy-chain) is 7, and the maximum number of physical output ports on each branch device (such as a hub) is 7. With the release of MST, standard single-display operation has been retroactively named "SST" mode (Single-Stream Transport). Daisy-chaining is a feature that must be specifically supported by each intermediary display; not all DisplayPort 1.2 devices support it. Daisy-chaining requires a dedicated DisplayPort output port on the display. Standard DisplayPort input ports found on most displays cannot be used as a daisy-chain output.
Addition of adjuvants is necessary during manufacturing to increase the efficacy of these vaccines. Patients will have to receive booster doses to maintain long-term immunity. Selection of appropriate cell lines for the cultivation of subunits is time-consuming because microbial proteins can be incompatible to certain expression systems.
Modafinil sulfone (code name CRL-41056) is an achiral, oxidized metabolite of modafinil, a wakefulness-promoting agent. It is one of two major circulating metabolites of modafinil, the other being modafinil acid. Modafinil sulfone is also a metabolite of the modafinil prodrug, adrafinil. Modafinil sulfone is also a metabolite of armodafinil, the (R)-(–)-enantiomer of modafinil, as oxidation to the sulfone removes the chiral center at the sulfur atom. Modafinil sulfone has been described as inactive, and similarly to modafinil acid, does not appear to contribute to the wakefulness-promoting effects of modafinil. However, like modafinil, modafinil sulfone was found to show anticonvulsant properties in animals, indicating that it does possess some biological activity.
Originally a Russian production, all in Russian with subtitles, produced by Maciej Drygas 15 October High Anxiety, about lifts and the required extensive technology of tall office buildings; Canary Wharf Tower (One Canada Square) had 50 floors with 36 lifts, which could travel up to 13.5 mph; Jim Fortune of Lerch Bates; novelist Philip Kerr; Otis Elevators alarm response centre of Farmington, Connecticut, which dealt with trapped passengers - it took about 20 minutes to rescue people; the Otis Test Tower, at Bristol in Connecticut, which had 29 floors and 11 lifts; architect Ken Yeang of Malaysia, known for his tall buildings; Gary Faltin of Otis; in the distant past, due to ropes, only goods were carried by lifts; in 1853 Elisha Otis invented a safety system for lifts, via a governor cable; only once have steel lift cables snapped, on 28 July 1945, in the 1945 Empire State Building B-25 crash after being lost in fog, severing the lift governor cable; if the cable snapped, due to the lift being balanced only after about nine people were in a lift, the lift would go upwards; on 12 August 1995, in the Empire State Building, a lift did go upwards, to be trapped at the 80th floor; the Woolworth Building, with 57 floors and 26 lifts, which could travel up to 10 mph - it was the world's tallest building from 1911 to 1930; engineer William Sheeran of Otis; medical doctor Rollin Stott, of the Linear Motion Laboratory of the Defence Research Agency (DERA) Centre for Human Sciences in north-east Hampshire; the feelings in the stomach, often sensed in a lift, comes from a pulse of adrenaline; Convent of Sacred Heart, with six floors; Nicole Fenchel was phobic of lifts; Doreen Powell of White Plains Hospital; the express lift, for the observation platform, in Tower 2 of the former World Trade Center had a journey time of 58 seconds; the former WTC had the world's second and third tallest office buildings; Tower 1 had 110 floors, being 417 metres high, with 96 lifts that could travel up to 15 mph; 70,000 people worked in the former WTC; people should not have to wait for a lift for no more than 30 seconds; Roger Howkins of Arup in London; 200 Vesey Street, known as Three World Financial Center, with 51 floors and 39 lifts, that could travel up to 14 mph; the former WTC was the first building to introduce the sky lobby design, with interspersed lifts; Robert DiChiara, assistant director of the former WTC; engineer Bruce Powell of Otis; Argentine architect, César Pelli, who designed One Canada Square of Canary Wharf; control systems of lifts anticipated demand; but there was a dark and menacing side to travel by lifts - Detectives Kevin Dineen and Lisa McClean of the NYPD Elevator Squad, at Carver Houses in the East Village, Manhattan, and how criminals could isolate victims; local youths and children would travel on top of the elevators for momentary thrills; the New York Marriott Marquis hotel, with 49 floors and 12 elevators, which could travel up to 15 mph; the Petronas Towers in Malaysia, with 88 floors, and 76 lifts, that could travel up to 16 mph, to be completed by 1997; lift ropes could go up to 600 metres, at the extreme most; new lifts would be powered by tubular linear motors or AC induction motors; 600 lifts with these new motors were operating in Japan; Yebisu Garden Place in Ebisu, Shibuya in Tokyo, where linear motors powered the lift counterweight; the Nishi-Shinjuku district in Shinjuku, Tokyo; many tall buildings were being built in Japan; Riverside Sumida Center, of Tokyo, built in 1994; the Yokohama Landmark Tower, with 70 floors, in Japan, built in 1993; Mitsubishi Electric had the world's fastest lifts, up to 28 mph; Junichi Sato of Mitsubishi, who said that he thought that Japanese people valued well-made products, and only trusted manufacturers too, whereas he thought that Americans and Europeans merely wanted functional products, whether good or not; the proposed enormous 800 metre Millennium Tower (Tokyo) for Tokyo Bay, with 150 floors, which was never built, but the Gherkin (30 St Mary Axe) was built instead; architect Andrew Miller of Foster Asia; there were twenty buildings over 60 floors being built; the Chinese economy was growing by 15% per year, and was Mitsubishi's biggest customer; the Century Tower (Tokyo), built in 1991, with 21 floors, with 14 lifts, that could travel up to 11 mph; lift technology had allowed Western business to prosper, but now it was superfluous for Western business. Narrated by Paul McGann, produced by Elizabeth Allen, directed by Gary Johnstone, made by Diverse Productions 22 October DNA in the Dock, an Equinox Special that was an update on the Incredible Evidence episode on 28 December 1994; The murder of 15-year-old Claire Hood, last seen on 19 January 1995, where 2,100 men had their DNA tested; her body was found in Cath Cobb Woods the next day; Sir Alec Jeffreys claimed that he could tell anyone apart; Timothy Wilson Spencer was the first person to be executed, with DNA evidence, on 27 April 1994, having committed murder in 1988; DCI Stuart Lewis, who worked on the Claire Hood investigation, who believed that her killer lived nearby - her killer lived 100 yards away; the United Kingdom National DNA Database began earlier in 1995, and in six months, 60,000 DNA specimens were recorded, and the database was intended to have 5 million specimens; an investigation of Orchid Cellmark, part of ICI, found that errors in correlation of specimens were made; California police gave test specimens to Cellmark, and errors were found, which Cellmark attributed to cross-contamination; Donald Findlay and a Scottish rape investigation in Largs, North Ayrshire, in 1987; former policeman Brian Kelly, and his wrongful conviction, for six years, serving four of them, for rape on 30 November 1989, through DNA evidence alone - DNA testing would later change in 1990, where crime scene DNA specimens were kept apart; Kary Mullis, who invented the PCR test in 1983, receiving the 1993 Nobel Prize in Chemistry, and knew about errors in DNA genetic testing; David Werrett of the Forensic Science Service, who set up the UK national DNA database in Birmingham, which deployed the PCR method - the more reliable Second Generation Multiplex Plus would be later introduced in 1999; Don Dovaston, later the deputy chief of Derbyshire Constabulary, which was the first police force to identify suspects through the UK DNA database; the Metropolitan Police had its own DNA database; Larry Mueller, population geneticist at the UCI School of Biological Sciences. Produced by David Poyser, directed by Hilary Lawson, made by TVF 5 November Kaboom!, the explosives engineer Sidney Alford; Controlled Demolition, Inc., founded by Jack Loizeaux; Rev Ron Lancaster, originally from Huddersfield, who founded Kimbolton Fireworks in 1964, when a chemistry teacher at Kimbolton School; in 1847 Ascanio Sobrero of Italy discovered nitroglycerin - nitroglycerin is the main component of dynamite; a detonation occurs at supersonic speed; Semtex was developed in Czechoslovakia in the 1960s; Ballistite, made from nitroglycerin and discovered in 1887, is the propellant for guns. Joint-production with NOVA and WGBH. Shown on Nova on 14 January 1997 12 November Avalanche, avalanches kill around two hundred people a year, with 120 of those in the Alps; Swiss physicist Othmar Buser of the Swiss Federal Institute for Forest, Snow and Landscape Research (WSL), who developed a database of avalanches; Bruce Tremper; Doug Fesler; powder snow avalanches can reach 150 mph; Laurent Buisson. Narrated by Heather Couper, made by Pioneer Productions with Discovery Networks 19 November God only Knows, about how some physicists see theology being explained through physics, such as Frank J. Tipler of Tulane University and his book The Physics of Immortality; George Johnson (writer) and book titles; Lewis Wolpert and how there was no evidence for God in the external world; David Finley of the National Radio Astronomy Observatory; religious writer Karen Armstrong, author of A History of God; Brazilian physicist Marcelo Gleiser; physicist Leon M. Lederman; Russell Stannard and physics before the big bang; the KTeV experiment at Fermilab, which looked at kaons, and Vivian O'Dell; Rev John Polkinghorne, former professor of Mathematical Physics at the University of Cambridge. Narrated by Bill Paterson, produced by Nicolas Kent, directed by Peter Webber 26 November Gloria's Toxic Death, about the death of Gloria Ramirez in California on 19 February 1994; a nurse, who took a blood sample from her, passed out from inhaling an unknown vapour coming from the blood sample; few episodes of Doctor Who had such a bizarre and unbelievable storyline; blood tests from the nurses revealed a lowering of the enzyme cholinesterase, which in other cases is linked to organophosphate poisoning; the Lawrence Livermore National Laboratory proposed a connection to dimethyl sulfoxide (DMSO) that had combined with oxygen given in the hospital to make dimethyl sulfate; the conditions of the hospital were repeated in a test, and the results underwent gas chromatography–mass spectrometry by Yolanda de Miguel at Department of Chemistry, Imperial College London. Narrated by Neil Pearson, directed by Tim Shawcross, produced by Geoff Deehan, made by Union Pictures with Discovery Communications 3 December On Jupiter, about the large gravitational effect that Jupiter has on the solar system; if the mass of Jupiter was thirty times bigger, the heat in its centre could sustain nuclear reactions, and it could become a star, maybe a brown dwarf; Gene Shoemaker of the Lowell Observatory and Palomar Observatory; Galileo Galilei discovered Jupiter's moons, Io, Europa, Ganymede (the largest moon in the solar system), and Callisto, on 7 January 1610; Heidi Hammel of MIT; Galileo (spacecraft), built at JPL and Ames in the 1980s, being planned to have launched in 1982, arrived at Jupiter on 7 December 1995; Torrence Johnson of JPL; Jim Scotti of the Spacewatch project at Kitt Peak National Observatory; Brian G. Marsden of the Central Bureau for Astronomical Telegrams; Vicki Meadows of the Anglo-Australian Telescope; Imke de Pater of the W. M. Keck Observatory on Mauna Kea; David Morrison (astrophysicist) of NASA Ames. Narrated by John Hurt, directed by Richard Smith, made by Pioneer Productions and the Discovery Channel 10 December Designing Dream Machines, about product innovation and product design of food processors and a reinvented motorbike by the Seymour-Powell design agency and its designer Nick Talbot, with the management team of Tefal UK and its managing director and a design by 43-year-old Dick Powell, and a possible new design of the ubiquitous 125CC BSA Bantam motorbike for MZ Motorrad- und Zweiradwerk of Germany by 42-year-old Richard Seymour; the 59 Club; Leigh Martin of the defunct Comet (closed in December 2012). Narrated by Marilyn Milgrom, directed by Richard Burke, produced by Richard Reisz. TV6 went on to make the six-part series Better by Design 17 December It Runs on Water, about the field commonly known as fringe science, where physicist Frank Close was sceptical if not broadly dismissive, stating that 300 years of science could not be overruled, but a professor of Aeronautics Paul Csysz of Saint Louis University mentioned that he thought some people in science were often unquestioning of their lifelong-held beliefs, and nervous of anyone trying to do so; an invention in Moscow was looked at by American physicist Harold E. Puthoff; Stanley Meyer's water fuel cell; NASA's propulsion research at Lewis Research Center in Cleveland, Ohio; it ends with Sir Arthur C. Clarke and Requiem (Mozart). Directed by Lawrence Simanowitz, produced and narrated by William Woollard, made by InCA Productions with Discovery Communications 20 December Do Vampire Bats have Friends?, an Equinox Special about whether animals have consciousness; zoologist Prof John Krebs, Baron Krebs, and whether animals had human-like sentience; biologist Gerald Wilkinson of the University of Maryland, and research, over five years, into relationships of vampire bats with other types of animals, and found food sharing between hungry vampire bats; zoologist Miriam Rothschild; psychologist Cecilia Heyes of UCL and self-perception of chimpanzees; zoologist Bernd Heinrich of the University of Vermont, and puzzle-solving of raven birds; zoologist Benjamin Beck of The National Zoo, and the apparent deployment of tools by animals; Ian Farquhar, and foxhunting, and whether foxes realise their predicament, and the Duke of Beaufort's Hunt in Gloucestershire; biologist Sir Patrick Bateson of the University of Cambridge, sensation of pain in animals, and the Animals (Scientific Procedures) Act 1986, which defined protected animals, that did not cover the octopus, but due to research by the Universities Federation for Animal Welfare (UFAW); Prof Peter Boyle and Martin Wells, and a 1993 amendment added the octopus; Prof Daniel Dennett of Tufts University, and how snakes think; psychologist Irene Pepper berg, of the University of Arizona, and an African Grey parrot called Alex, who has been talking for 18 years; the horse Clever Hans; Robert Seyfarth (scientist) and Dorothy Cheney (scientist), and their work on baboon warning calls and grunts, in Kenya. Narrated by Andrew Sachs, directed by Christopher Sykes, made by Christopher Sykes Productions
Sources: en.wikipedia.org
It consists of a three-amino-acid peptide, glycine-histidine-lysine, bound to one copper(II) ion. The peptide supplies four nitrogen donor atoms, and the resulting complex is stable in neutral aqueous solution. The metal-free peptide is usually called GHK.
The three letters are the standard one-letter codes for glycine, histidine, and lysine. The suffix -Cu indicates the coordinated copper ion. Cosmetic ingredient lists often use the alternative name copper tripeptide-1 for the same complex.
No. Free GHK is the peptide alone, while GHK-Cu contains a bound copper atom. The two differ in colour, charge, and binding behaviour, so any study that measures copper delivery must state which form was used.
Dry powder is typically stored frozen at −20 °C or lower, protected from moisture and light. Short-term working amounts may be kept refrigerated. Avoiding repeated temperature changes helps preserve the material.