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Restriction fragment length polymorphism (RFLP) heterogeneity of HLA-DQ beta genes associated with DNA fragment identical to the DR1-beta DNA structure.

Restriction fragment length polymorphism (RFLP) analyses of DR1 positive peripheral blood leukocytes DNA was carried out. The Taq I digested DNA was hybridized with cDNA probes for HLA-DR and -DQ beta genes. The DR probe detected fragments commonly observed in the DR1 specificity, whereas a new DQ-beta fragment was detected in some DR1 haplotypes when the DQ-beta probe was used. This fragment had an RFLP pattern identical to the DQ-beta fragment typically associated with most DR2 and some DRw6 specificities.