versions of the MHC receptors in the population, though any one individual can have no more than two versions for any one locus. MHC receptors are codominantly expressed, meaning all inherited alleles are expressed by the individual. The wide variety of potential alleles and multiple loci in the HLA allow for many unique combinations in individuals.

Role in transplantation

After receiving a transplant, the recipient's T cells will become activated by foreign MHC molecules on the donor tissue and trigger the immune system to

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