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Cysteine is therefore dependent on methionine (an essential amino acid), as it is produced whenever there is sufficient methionine, and a methionine deficiency would in turn cause lower endogenous synthesis of cysteine

GHK binds copper because of a specific combination of functional groups that together form a high-affinity copper-coordination site: the N-terminal amine donates one nitrogen ligand, the histidine imidazole donates a second nitrogen ligand, and the deprotonated amide nitrogen of the Gly-His peptide bond donates a third nitrogen ligand

The Legal BAC Limit The legal BAC limit varies from country to country, and in some cases, from state to state

It's unclear exactly why they died, but that delayed the field of gene therapy by at least a decade