. "This entry has been included to accommodate those protein-histidine kinases for which the phosphorylation site has not been established (i.e. either the pros-or tele-nitrogen of histidine)." . "A number of histones can act as acceptor." . . . "HK1" . "Histidine kinase" . "Protein kinase" . "Histidine protein kinase" . "Protein histidine kinase" . "Protein kinase (histidine)" . "ATP + protein L-histidine = ADP + protein N-phospho-L-histidine." .