Figure 1

RT-PCR analysis of CYP2A13 mRNA expression in non-cancerous nasopharynx and primary NPC tumors. Eight non-cancerous nasopharynx tissues and 14 NPC tissues were detected. The expected product size is 494 bp. Expression of GAPDH (580 bp) was amplified as an endogenous control. Lanes 1–8: RT-PCR of RNA from human non-cancerous nasopharynx tissues; lanes 9–22: RT-PCR of RNA from NPC tissues; M: DL 2000 molecular weight marker.