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Native human IGF-1 is a 70-residue single-chain protein with an insulin-like fold: A and B domains homologous to the insulin A and B chains, joined by a C domain that is retained rather than excised as insulin's C-peptide is, plus a short D extension
Alternatively, continuous daily dosing for 12 weeks followed by a 4-week break is another common approach
GHK-Cu (Copper Peptide): Known for its role in skin repair and collagen synthesis
Moreover, more recently a family of proteins called peroxiredoxins has been recognized as catalyzing the reduction of H 2 O 2 by GSH and/or other thiols, but with cysteine in its thiolate form, in their active sites rather than selenium-cysteine (Eaton and Bammler, 1999
