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Here, the authors report a readily cleavable N-selenoethyl group attached to cysteine and apply it to the modular assembly of linear and cyclic polypeptides.

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GHK-Cu, or Glycyl-L-Histidyl-L-Lysine-Copper, is a tripeptide consisting of three amino acids bound to a copper ion

B vitamins generally have a low risk of interacting with medications, though some supplements can cause interference