Methods In vitro, mixed tk+BEL 7402 cells and tk BEL 7402 cells in diverse proportions and ganciclovir (GCV) was given, then tested the survival ratio of cells by MTT.

• 方法 采用向体外培养的tk阴性人肝癌BEL 74 0 2细胞中加入不同比例tk阳性同种细胞 ;