Figure 3: Electrophoresis of PCR product of VIP, VPAC1, and beta-actin mRNA in different groups. (a) stands for VIP, (b) for VPAC1, and (c) for beta-actin. M stands for marker DL600, K for MKN45 cells, C for NK cells, A for NK cells + VIP, and B for NK cells + VIP + VIP antagonist. The length of PCR products of VIP, VPAC1, and beta-actin was 361 bp, 432 bp, and 500 bp.