Used as organic synthesis and medicine intermediate.

Human proinsulin, the single-chain peptide precursor of insulin, consists of the insulin A and B chains connected by the 31 amino acid C-peptide. Cleavage of proinsulin by proteolytic enzymes produces insulin and free C-peptide.

Chemerin-9 (149-157) TFA, the nonapeptide (149)YFPGQFAFS(157) (chemerin-9), corresponding to the C terminus of processed chemerin, retains most of the activity of the full-size protein, with regard to agonism toward the chemerinR.