Effect of CepR on bviIR expression in PC259 by RT-PCR. Products were electrophoresed on a 1.0% gel. Lane 1, ladder; lanes 2a to 2c, product amplified by RTbviIF and RTbviIR; lanes 3a to 3c, product amplified by RTbviRF and RTbviRR; lanes 4a to 4c, product amplified by RTsigAF and RTsigAR; lane 5, ladder. Lanes a, PC259 RNA; lanes b, PC259cepR RNA; lanes c, no-template control.