| IPR000510 | Nitrogenase/oxidoreductase, component 1 | Domain |
| IPR005972 | Nitrogenase molybdenum-iron protein alpha chain | Family |
| IPR000318 | Nitrogenase component 1, conserved site | Conserved Site |
| IPR010143 | Nitrogenase component 1, alpha chain | Family |
| IPR000510 | Nitrogenase/oxidoreductase, component 1 | Domain |
| IPR005976 | Nitrogenase molybdenum-iron protein beta chain | Family |
| IPR000318 | Nitrogenase component 1, conserved site | Conserved Site |
| IPR050152 | ChlB/BchB/BchZ | Family |
CA [auth Z], DA [auth c], J [auth H], K [auth J], L [auth R], M [auth T], N [auth b], O [auth d], U [auth F], V [auth I], Y [auth P], Z [auth S] | IPR015867 | Nitrogen regulatory protein PII/ATP phosphoribosyltransferase, C-terminal | Homologous Superfamily |
CA [auth Z], DA [auth c], J [auth H], K [auth J], L [auth R], M [auth T], N [auth b], O [auth d], U [auth F], V [auth I], Y [auth P], Z [auth S] | IPR011322 | Nitrogen regulatory PII-like, alpha/beta | Homologous Superfamily |
CA [auth Z], DA [auth c], J [auth H], K [auth J], L [auth R], M [auth T], N [auth b], O [auth d], U [auth F], V [auth I], Y [auth P], Z [auth S] | IPR002187 | Nitrogen regulatory protein PII | Family |
CA [auth Z], DA [auth c], J [auth H], K [auth J], L [auth R], M [auth T], N [auth b], O [auth d], U [auth F], V [auth I], Y [auth P], Z [auth S] | IPR017918 | Nitrogen regulatory protein PII, conserved site | Conserved Site |
| IPR015867 | Nitrogen regulatory protein PII/ATP phosphoribosyltransferase, C-terminal | Homologous Superfamily |
| IPR011322 | Nitrogen regulatory PII-like, alpha/beta | Homologous Superfamily |
| IPR002187 | Nitrogen regulatory protein PII | Family |
| IPR017918 | Nitrogen regulatory protein PII, conserved site | Conserved Site |