Homologs of Rru_A0665 from Rhodospirillum rubrum S1H
Response regulator receiver domain protein (CheY) (NCBI)
SEED: Two-component response regulator
Top 100 hits from BLASTp (E < 0.01)
Or try PaperBLAST, fast.genomics, the ENIGMA genome browser, or the comparative fitness browser