| Chain | GOid | namespace | contents |
| A | 0006144 | biological_process | purine nucleobase metabolic process |
| A | 0016787 | molecular_function | hydrolase activity |
| A | 0033971 | molecular_function | hydroxyisourate hydrolase activity |
| B | 0006144 | biological_process | purine nucleobase metabolic process |
| B | 0016787 | molecular_function | hydrolase activity |
| B | 0033971 | molecular_function | hydroxyisourate hydrolase activity |
| C | 0006144 | biological_process | purine nucleobase metabolic process |
| C | 0016787 | molecular_function | hydrolase activity |
| C | 0033971 | molecular_function | hydroxyisourate hydrolase activity |
| D | 0006144 | biological_process | purine nucleobase metabolic process |
| D | 0016787 | molecular_function | hydrolase activity |
| D | 0033971 | molecular_function | hydroxyisourate hydrolase activity |