Heme biosynthesis, animals and fungi, glycine => heme
Brite
Enzymatic reactions [BR:br08201]
1. Oxidoreductase reactions
1.3 Acting on the CH-CH group of donors
1.3.3 With oxygen as acceptor
1.3.3.3
R03220 Coproporphyrinogen III + Oxygen <=> Protoporphyrinogen IX + 2 CO2 + 2 H2O