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Sa 1, a Possible New HL‐A Specificity Found in the Japanese Population

Abstract. A possibly new HL‐A specificity, associated with W22, was found in the Japanese. Population and family studies indicate that the gene Sa 1 (frequency 0.0771) behaves as a ‘new’ allele at FOUR sublocus. A case of crossing over between the LA and FOUR loci of the HL‐A system was also described.