Four new DR52-associated DRB1 alleles are described. One al lele, DRB1*1130
, is a hybrid between a DRB3*02 allele and a DRB1*11011 allele. The other a
lleles, DRB1*13072, DRB1*1315, and DR131*1331, are simple reshufflings of k
nown polymorphic motifs.