A key difference between MHC-I and MHC-II molecules is:单项选择题

A

Only MHC-I genes are polymorphic

B

The a2 chain participates in peptide-binding on MHC-II molecules only

C

The Beta chain participates in peptide-binding on MHC-II molecules only

D

MHC-II is expressed on all cells, whereas MHC-I expression is restricted

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