| IPR018247 | EF-Hand 1, calcium-binding site | Binding Site |
| IPR002048 | EF-hand domain | Domain |
| IPR011992 | EF-hand domain pair | Homologous Superfamily |
| IPR050145 | Centrin/CML-like | Family |
| IPR001709 | Flavoprotein pyridine nucleotide cytochrome reductase | Domain |
| IPR001433 | Oxidoreductase FAD/NAD(P)-binding | Domain |
| IPR001094 | Flavodoxin-like | Domain |
| IPR004030 | Nitric oxide synthase, N-terminal | Domain |
| IPR023173 | NADPH-cytochrome p450 reductase, FAD-binding, alpha-helical domain superfamily | Homologous Superfamily |
| IPR008254 | Flavodoxin/nitric oxide synthase | Domain |
| IPR039261 | Ferredoxin-NADP reductase (FNR), nucleotide-binding domain | Homologous Superfamily |
| IPR017927 | FAD-binding domain, ferredoxin reductase-type | Domain |
| IPR036119 | Nitric oxide synthase, N-terminal domain superfamily | Homologous Superfamily |
| IPR044944 | Nitric oxide synthase, domain 3 superfamily | Homologous Superfamily |
| IPR044943 | Nitric oxide synthase, domain 1 superfamily | Homologous Superfamily |
| IPR003097 | Sulfite reductase [NADPH] flavoprotein alpha-component-like, FAD-binding | Domain |
| IPR017938 | Riboflavin synthase-like beta-barrel | Homologous Superfamily |
| IPR044940 | Nitric oxide synthase, domain 2 superfamily | Homologous Superfamily |
| IPR029039 | Flavoprotein-like superfamily | Homologous Superfamily |
| IPR050607 | Nitric Oxide Synthase (NOS) | Family |
| IPR012144 | Nitric-oxide synthase, eukaryote | Family |