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48.人体胰岛B细胞合成分泌胰岛素的过程中,胰岛B细胞的生理变化不包括( )
A.生物膜系统活动加强 B.分泌某种能使人血糖下降的物质
C.产生指导胰岛素合成的基因 D.产生指导胰岛素合成的m RNA