病毒癌基因最常为逆转录病毒致癌基因的产物。通常具有转化和蛋白激酶活性。
Products of viral oncogenes, most commonly retroviral oncogenes. They usually have transforming and often protein kinase activities.
由于病毒可能会意外地启动细胞本身含有的致癌基因，因此这种方法生成的干细胞用在患者身上就不够安全。
Because the virus could accidentally switch on cancer genes, the cells would not be safe enough to use in patients.
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