Homologs of cheA from Escherichia coli BW25113
cheA: fused chemotactic sensory histidine kinase in two-component regulatory system with CheB and CheY: sensory histidine kinase/signal sensing protein (NCBI)
SEED: Signal transduction histidine kinase CheA (EC 2.7.3.-)
KEGG: two-component system, chemotaxis family, sensor kinase CheA
Top 100 hits from BLASTp (E < 0.01)
Or try PaperBLAST, fast.genomics, the ENIGMA genome browser, or the comparative fitness browser