| Chain | GOid | namespace | contents |
| A | 0004418 | molecular_function | hydroxymethylbilane synthase activity |
| A | 0005737 | cellular_component | cytoplasm |
| A | 0006779 | biological_process | porphyrin-containing compound biosynthetic process |
| A | 0006782 | biological_process | protoporphyrinogen IX biosynthetic process |
| A | 0006783 | biological_process | heme biosynthetic process |
| A | 0016740 | molecular_function | transferase activity |
| A | 0018160 | biological_process | peptidyl-pyrromethane cofactor linkage |
| A | 0033014 | biological_process | tetrapyrrole biosynthetic process |
| A | 0046148 | biological_process | pigment biosynthetic process |