40.一個B細胞只能表現一種抗體之原因為何?
(A)Allelic exclusion
(B)Somatic hypermutation
(C)Class switch
(D)Epitope spreading
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統計: A(1023), B(288), C(448), D(168), E(0) #2972714
統計: A(1023), B(288), C(448), D(168), E(0) #2972714