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A new antigen, TY, of the human histocompatibility HL–A system is described. The frequency of TY in a Caucasian population is 0.0363. Studies indicate that the gene TY (frequency 0.0183) behaves as an allele of the FOUR (2nd) HL–A locus.
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Gelsthorpe et al. (1973) studied this question.
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