from Bordetella pertussis; consensus DNA sequence located in the vrg coding region is sufficient to confer vrg transcriptional regulation, & this site in the DNA is specifically recognized by a 34 kDA repressor of the vir-repressed genes; amino acid sequence known; five types of the vir-repressed genes have been identified; vrg 6, 18, 24, 53, and 73 from Bordetella pertussis