試題詳解

複選題
30. The diversity of MHC class I and II genes is due to____________. (Select all that apply.)
(A) gene rearrangements similar to those observed in T-cell receptor genes
(B) the existence of many similar genes encoding MHC molecules in the genome
(C) somatic hypermutation
(D) extensive polymorphism at many of the alleles
(E) jsotype switching