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【单选题】
干扰素是治疗癌症的重要药物,以前它必须从人血液中提取,每 300 L 人血中只能提取出 1 mg ,所以价格昂贵。美国加利福尼亚的某生物制药公司用如下方法生产干扰素。如图所示: 从上述可以看出该公司生产干扰素运用的方法是 ( )
A.
个体间的杂交
B.
基因工程
C.
细胞融合
D.
器官移植
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