Individuals from all over USA.Alleles identical in sequence in exons 2+ 3 cannot be distinguished.Frequency is given under the first allele e.g frequency for B*0705/B*0706 is given under B*0705.Consult IMGTd/base for list of undistinguishable alleles
Allele frequency net: a database and online repository for immune gene frequencies in worldwide populations.
Gonzalez-Galarza FF, Christmas S, Middleton D and Jones AR
Nucleic Acid Research 2011, 39, D913-D919.
Liverpool, U.K.