Fig. 4From: Co-fitness analysis identifies a diversity of signal proteins involved in the utilization of specific c-type cytochromesClassification of signal transduction proteins in modules 4 and 5. OCP, one-component proteins; TCP, two-component proteins; RR, response regulator; HRR, hybrid response regulator; HK, histidine kinase; HHK, hybrid histidine kinaseBack to article page