Your Query returns 4 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
HLA-DRB1*13 variantAY1788459606HLA-DRB1   
HLA-DRB1*13 variantAF3052129606HLA-DRB1   
HLA-DRB1*13 variantAJ4880669606
HLA-DRB1*13 variantAJ4880669606

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

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Text2Knowledge ... Yong Huang 2002