Your Query returns 6 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
DRB1*0301AF0127209870DRB1   
DRB1*0301AF0129349749MHC Dele-DRB1   
DRB1*0301S699879606HLA-DRB1   
DRB1*0301AJ5441689493
DRB1*0301AJ5441689493
DRB1*0301X826609606

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

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Text2Knowledge ... Yong Huang 2002