Which of the following BEST represents the relationship of polypeptide units in MHC class II?
A. ? and ? chains from any gene can pair with each other.
B. Only ? and ? chains from the same gene can pair with each other.
C. Only ? and ? chains of the same allele can pair with each other.
D. ? chains can pair with other ? chains, but ? chains can only pair with ? chains.
E. ? and ? chains pair until the complex is exported to the cell surface and can bind ?-2 microglobulin.
B
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