About database
NMDP Explorer
Maiers, M., Gragert, L., Klitz, W. High resolution HLA alleles and haplotypes in the US population. Human Immunology (2007) 68, 779-788.
http://bioinformatics.nmdp.org/HLA/hla_res_idx.html
DNA Explorer
based on DNA data from Derek Middleton
http://www.allelefrequencies.net/test/beta.asp
Serology Explorer
based on data from participating stem cells donor registries.