Your Query returns 18 Accession Numbers:
Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
HLA-B*3801AH0127379606HLA-B   
HLA-B*3801AY2503429606HLA-B   
HLA-B*3801AY2503439606HLA-B   
HLA-B*3801AY2503449606HLA-B   
HLA-B*3801AY2503459606HLA-B   
HLA-B*3801AY2503469606HLA-B   
HLA-B*3801AY2503479606HLA-B   
HLA-B*3801AY2503489606HLA-B   
HLA-B*3801AY2503499606HLA-B   
HLA-B*3801L799279606HLA-B   
HLA-B*3801L799339606HLA-B   
HLA-B*3801L799359606HLA-B   
HLA-B*3801AJ4958859606
HLA-B*3801AJ4959399606
HLA-B*3801AJ4959939606
HLA-B*3801AJ5498989606
HLA-B*3801L365919606
HLA-B*3801L799179606

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* OMIM link based on symbol match for human and mouse.

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Text2Knowledge ... Yong Huang 2002