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A) Biosynthetic gene cluster of NOS; B) The amino acid sequence of NosM; and C) The proposed NOS biosynthetic pathway; I. formation of the thiazole rings; II. attachment of MIA to Cys8 of the core peptide; III. NosN-catalyzed formation of the side-ring structure; IV. formation of dehydrated amino acids; V. formation of the central pyridine ring.
