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普通烟草的叶容易被虫吃掉�学家�现苏��杆菌能产生杀死该虫的毒素于是将苏��杆菌中产生杀虫毒素的基因转入到普通烟草细胞中得到了抗虫效果 Template






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sketch 3222 Late happy valentine&#;s from Tiffa Hidalgo Jordan Coquet
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