皮皮学，免费搜题
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【单选题】
下列关于原癌基因的说法不答案:正确的是A.
指人类或其他动物细胞（以及致癌病毒）固有的一类基因
B.
能诱导细胞正常转化并使之获得新生物特征的基因总称
C.
包括病毒癌基因和细胞癌基因
D.
正常情况下以激活形式存在
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