HLA-DQA1 belongs to the HLA<unk>  II<unk>  chain paralogues. This<unk>  II molecule is a heterodimer consisting of an<unk>  <unk> A) and a beta chain <unk> B), both anchored in the membrane. It plays a central role in the immune system by presenting peptides derived from extracellular proteins.<unk>  II molecules are expressed in antigen-presenting cells (APC: B lymphocytes, dendritic cells, macrophages).
Major histocompatibility complex, class II, DQ alpha 1
Common gamma chain
Ii antigen system
Complement receptor 1
Fc receptor
A-234 
Tx2-6
CD94/NKG2