Defined specificities of the HLA-C locus possess a significantly lower immunogenicity as compared with the HLA-A and HLA-B specificities. HLA-C "blanks" are not immunogenic at all. Among the possible explanations, the most likely one appears to be a low phenotypic expression of these alleles. C locus antigens as a whole are thus likely to be of minor relevance in donor/recipient matching for transplantation.
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Ferrara et al. (1978) studied this question.
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