题目内容
下列有关IgM说法正确的是
2021-09-23
A.IgM在分子结构上有铰链区
B.天然的血型抗体为IgM
C.IgG的溶血作用比IgM强
D.在个体发育中合成较晚
E.分泌型IgM为四聚体
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