Heme, porphyrin, and cobalamin

5-aminolevulinate synthase (RefSeq)

Porphobilinogen deaminase (PBG) (Hydroxymethylbilane synthase) (HMBS) (Pre-uroporphyrinogen synthase) (RefSeq)

5-aminolevulinic acid synthase (ALAS) (RefSeq)

Threonine-phosphate decarboxylase (L-threonine-O-3- phosphate decarboxylase) (RefSeq)

Cobalamin biosynthesis protein cobD (RefSeq)

cobyric acid synthase (RefSeq)

Precorrin-6A reductase (Precorrin-6X reductase) (RefSeq)

putative ferredoxin--nitrite reductase (nirA-like) (RefSeq)

heme O synthase (RefSeq)

Cobaltochelatase (cobS protein) (RefSeq)