Your Query returns 3 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
HLA-B*44021 variantAH0099359606HLA-B   
HLA-B*44021 variantAF3101409606HLA-B   
HLA-B*44021 variantAF3101419606HLA-B   

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

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Text2Knowledge ... Yong Huang 2002