Homologs of Rru_A0773 from Rhodospirillum rubrum S1H
Nitrogenase (NCBI)
SEED: Nitrogenase vanadium-cofactor synthesis protein VnfE
KEGG: nitrogenase molybdenum-iron protein alpha chain
88 hits from BLASTp (E < 0.01)
Or try PaperBLAST, fast.genomics, the ENIGMA genome browser, or the comparative fitness browser