英美研究人员相继宣布:“去除排斥基因”的猪已经降生,人们可望

英美研究人员相继宣布:“去除排斥基因”的猪已经降生,人们可望利用这种猪大量“生产”适用于移植手术的器官。在此之前,如果把猪器官移植给人体,人体的免疫系统识别猪细胞上的x物质,从而发生强烈的排斥反应。x物质所处的位置和化学成分分别是

A.细胞膜   类脂                          B.细胞膜   糖蛋白

C.细胞核   脱氧核糖核酸                  D.细胞质    蛋白质

答案

B

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