| Porphyrin biosynthesis | early mitochondrial: D-Aminolevulinic acid
cytosolic: Porphobilinogen · Hydroxymethylbilane · Uroporphyrinogen III · Coproporphyrinogen III late mitochondrial: Protoporphyrinogen IX · Protoporphyrin IX |
|---|---|
| Heme degradation and excretion | |