Your Query returns 3 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
DRB1*0201AF0127199870DRB1   
DRB1*0201AF0129329749MHC Dele-DRB1   
DRB1*0201M960769598

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

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Text2Knowledge ... Yong Huang 2002