Methods Neomycin gene was transfected into human embryonic fibroblasts (HEF) by liposome mediated method. Using this transfected HEF as feeder layer, ES cells were transfected with AANAT gene.

• 方法 将外源性neo基因转染人胚胎成纤维细胞 ,作为饲养层细胞用于ES细胞转基因后筛选及增殖过程的培养。