A, B, C, D, E, F, G, H, I [auth J], J [auth K], K [auth L], L [auth M]  | IPR030655 | NifH/chlL conserved site | Conserved Site | 
 A, B, C, D, E, F, G, H, I [auth J], J [auth K], K [auth L], L [auth M]  | IPR000392 | NifH/frxC family | Family | 
 A, B, C, D, E, F, G, H, I [auth J], J [auth K], K [auth L], L [auth M]  | IPR005977 | Nitrogenase iron protein NifH | Family | 
 A, B, C, D, E, F, G, H, I [auth J], J [auth K], K [auth L], L [auth M]  | IPR027417 | P-loop containing nucleoside triphosphate hydrolase | Homologous Superfamily |