GCA_000018585.1 P9211_01421 definition two-component response regulator GCA_000018585.1 P9211_01481 definition two-component response regulator GCA_000018585.1 P9211_01871 definition two-component response regulator GCA_000018585.1 P9211_10741 definition two-component response regulator GCA_000018585.1 P9211_15001 definition Response regulator containing a CheY-like receiver domain and an HTH DNA-binding domain GCA_000018585.1 P9211_17451 definition two-component response regulator