This family consists of several bacterial flagellar transcriptional activator (FlhC) proteins. FlhC combines with FlhD to form a regulatory complex in E. coli, this complex has been shown to be a global regulator involved in many cellular processes as well as a flagellar transcriptional activator [1].

1: FlhD/FlhC-regulated promoters analyzed by gene array and lacZ gene fusions. Pruss BM, Liu X, Hendrickson W, Matsumura P; FEMS Microbiol Lett 2001;197:91-97. PMID:11287152