Homologs of Rru_A1392 from Rhodospirillum rubrum S1H
Nitrogenase (NCBI)
SEED: Nitrogenase (iron-iron) beta chain (EC 1.18.6.1)
KEGG: nitrogenase molybdenum-iron protein beta chain
76 hits from BLASTp (E < 0.01)
Or try PaperBLAST, fast.genomics, the ENIGMA genome browser, or the comparative fitness browser