| GO | Name |
| GO:0004857 | enzyme inhibitor activity |
| GO:0005634 | nucleus |
| GO:0005654 | nucleoplasm |
| GO:0005737 | cytoplasm |
| GO:0005829 | cytosol |
| GO:0006809 | nitric oxide biosynthetic process |
| GO:0009890 | negative regulation of biosynthetic process |
| GO:0016597 | amino acid binding |
| GO:0030425 | dendrite |
| GO:0030742 | GTP-dependent protein binding |
| GO:0031965 | nuclear membrane |
| GO:0032991 | protein-containing complex |
| GO:0042133 | neurotransmitter metabolic process |
| GO:0042470 | melanosome |
| GO:0043105 | negative regulation of GTP cyclohydrolase I activity |
| GO:0044549 | GTP cyclohydrolase binding |
| GO:0044877 | protein-containing complex binding |
| GO:0046146 | tetrahydrobiopterin metabolic process |
| GO:0065003 | protein-containing complex assembly |