Expression of SPI-CI in tumor and tissue samples. (A) Protein expression of SPI-CI in murine tumor cell lines. Expression was detected by the polyclonal antibody against SPI-CI. (B) Complementary DNA of different murine tissue samples was analyzed by RT-PCR. (Top) SPI-CI PCR for 30, 35, and 40 cycles. (Bottom) GAPDH PCR for 22, 25, and 28 cycles.