Members of this protein family are the regulatory histidine kinase PhoR associated with the phosphate ABC transporter in most Proteobacteria. Related proteins from Gram-positive organisms are not included in this model. The phoR gene usually is adjacent to the response regulator phoB gene (TIGR02154). [Signal transduction, Two-component systems]
Jiyao W et al.(2023). "The conserved domain database in 2023.",