Detection of PAR4 in rat DRG and artery by RT-PCR. PAR4 was assessed by the amplification of a specific 463-bp PCR fragment, whereas GAPDH was a 306-bp fragment. PAR4 was detected in rat DRG cultures (a, lanes 1–2; b, lane 2), and aorta (a, lane 5), but not in DRG culture in the absence of PAR4 primer (a, lanes 3–4; b, lane 3). (b) Lanes 2 and 3: RNA was pre-treated with DNAse, PAR4 primers were added in lane 2, but not in lane 3. (b) Lane 4: RNA was added in place of the RT product. Experiments shown are representative of four.