题目内容

蛋白激酶类细胞癌基因的产物为某种__，与生长因子结合后，形成蛋白质酪氨酸激酶，触发细胞内的一系列反应。例如，ERBB1癌基因的产物为表皮生长因子受体。

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基因治疗按其受体细胞不同分类，则有_、__两类

纽约时报名词解释

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A. to sing
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A. used
B. uses
C. was used
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