1.3.3.15 coproporphyrinogen III oxidase (coproporphyrin-forming) heme b biosynthesis IV (Gram-positive bacteria) 4.1.1.37 uroporphyrinogen decarboxylase heme b biosynthesis IV (Gram-positive bacteria) 4.99.1.9 coproporphyrin ferrochelatase heme b biosynthesis IV (Gram-positive bacteria)