Fig. 2

PCR-RFLP profiles of the different pbp genes digested by HaeIII and RsaI. a Profile of pbp1a gene, lanes 1–10 correspond to RFLP profiles; b profile of pbp2b gene, lanes 1–11 correspond to RFLP profiles. c Profile of pbp2x gene, lanes 1–13 correspond to RFLP profiles. Line M corresponds to DNA size standards (250 base pairs)