Your Query returns 9 Accession Numbers:
Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
HLA-B*270502AH0127329606HLA-B   
HLA-B*270502AY2503029606HLA-B   
HLA-B*270502AY2503039606HLA-B   
HLA-B*270502AY2503049606HLA-B   
HLA-B*270502AY2503059606HLA-B   
HLA-B*270502AY2503069606HLA-B   
HLA-B*270502AY2503079606HLA-B   
HLA-B*270502AY2503089606HLA-B   
HLA-B*270502AY2503099606HLA-B   

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

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Text2Knowledge ... Yong Huang 2002