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Schematic of an nonribosomal peptide synthetase (NRPS) assembly line. The peptidyl carrier domain (PCP) has a phosphopantethiene prosthetic group terminated with a thiol (wavy lines). The adenylation (A) domain activates amino acids and the condensation (C) domain makes the amide linkages. Termination is frequently catalyzed by a thioesterase (TE) domain.
