Your Query returns 3 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
HLA-B*51021 variantAH0091179606HLA-B   
HLA-B*51021 variantAF2268449606HLA-B   
HLA-B*51021 variantAF2268459606HLA-B   

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

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Text2Knowledge ... Yong Huang 2002