NCIt definition : HLA-DP4 antigen is a protein complex of the major histocompatibility complex, class
II DP protein in which the alpha subunit is encoded by the HLA-DPA1*0103 allele and
the beta subunit serotype is encoded by either the *0401 allele or the *0402 allele
of the HLA-DPB1 gene. This antigen represents the most common haplotype.;