Your Query returns 13 Accession Numbers:
Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
HLA-B*4901AH0127479606HLA-B   
HLA-B*4901AY2504229606HLA-B   
HLA-B*4901AY2504239606HLA-B   
HLA-B*4901AY2504249606HLA-B   
HLA-B*4901AY2504259606HLA-B   
HLA-B*4901AY2504269606HLA-B   
HLA-B*4901AY2504279606HLA-B   
HLA-B*4901AY2504289606HLA-B   
HLA-B*4901AY2504299606HLA-B   
HLA-B*4901AJ4959009606
HLA-B*4901AJ4959549606
HLA-B*4901AJ4960089606
HLA-B*4901AJ5499109606

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

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Text2Knowledge ... Yong Huang 2002