研究表明 s 型肺炎双球菌细胞外的荚膜中含有一种毒蛋白它可以使小鼠患败血症死亡而 r 型肺炎双球菌细胞外没有荚膜不能使小鼠患病根据荚 Template




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tomski研究表明 s 型肺炎双球菌细胞外的荚膜中含有一种毒蛋白它可以使小鼠患败血症死亡而 coloring