Citations for

1	HLA-DPA1, HLA-DPA2, HLA-DPB1, HLA-DPB2
	Class II genes of the human major histocompatibility complex. Evolution of the DP region as deduced from nucleotide sequences of the four genes.
	Gustafsson K, et al.
	J Biol Chem 262 : 8778-8786. 1987