用动物细胞工程技术获取单克隆抗体,下列实验步骤中错误的是() A. 将抗原注入小鼠体内,获得能产生抗体的B淋巴细胞 B. 用纤维素酶处理B淋巴细胞与小鼠骨髓瘤细胞 C. 用聚乙二醇作诱导剂,促使能产生抗体的B淋巴细胞与小鼠骨髓瘤细胞融合 D. 筛选杂交瘤细胞,并从中选出能产生所需抗体的细胞群,培养后提取单克隆抗体Professor James will
give us a lecture on the Western culture, but when and where _______ yet.
A.
hasn’t been decided B. haven’t decided C. isn’t being
decided D. aren’t decided