Heme, porphyrin, and cobalamin

Precorrin-3B C(17)-methyltransferase (Precorrin-3 methyltransferase) (Precorrin-3 methylase) (RefSeq)

cobyrinic acid a,c-diamide synthase (RefSeq)

Precorrin-4 C(11)-methyltransferase (Precorrin-3 methylase) (RefSeq)

Precorrin-6Y C(5,15)-methyltransferase [decarboxylating] (Precorrin-6 methyltransferase) (Precorrin-6Y methylase) (RefSeq)

Nicotinate-nucleotide--dimethylbenzimidazole phosphoribosyltransferase (NN:DBI PRT) (N(1)-alpha-phosphoribosyltransferase) (RefSeq)

Cobalamin synthase (RefSeq)

putative oxidase (RefSeq)