Figure 1. Detection of NPR-A and NPR-B mRNAs in human p-CEPI and CEPI-17-CL4 cells by RT–PCR. Lanes 1 and 2: NPR-A in human p-CEPI cells (donor ages 64 and 81); Lane 3: NPR-A in human CEPI-17-CL4 cells. The PCR product for NPR-A is equal to 179 bp. Lane 4: NPR-B in human CEPI-17-CL4 cells. The PCR product for NPR-B is equal to 237 bp. Lanes 5 and 6: NPR-B in human p-CEPI cells (donor ages 64 and 81).