A chain
a polypeptide component of insulin containing 21 amino acyl residues, beginning with a glycyl residue (NH2-terminus); insulin is formed by the linkage of an a chain to a b chain by two disulfide bonds; the amino-acid composition of the a chain is a function of species.
Synonym: glycyl chain.
In general, one of the polypeptides in a multiprotein complex.
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