FIG. 1.

B. pertussis TM1311, TM1312, TM1315, and TM1316. The orf1-phoA transcriptional fusion present in strains TM1312 and TM1316 and the orf2-phoA transcriptional fusion present in strains TM1311 and TM1315 are shown. The putative BvgR (ORF1 and ORF2) coding sequences are represented by black boxes. The 3′ terminus of the bvgS coding sequence is represented by gray boxes. The alkaline phosphatase coding sequence is represented by open boxes. The putative directions of transcription of the native genes and transcriptional fusions are indicated by arrows. Restriction enzyme recognition sequences are indicated as follows: E, EcoRI; B, BamHI; S, ScaI; X, XhoI; N, NcoI; A, ApaI.