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)