Your Query returns 2 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
RT1-Aw2NM_01264510116RTS    MHCRTA    RT1Aw2   
RT1-Aw2BC06181710116RT1Aw2    MHCRTA    RTS   

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

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Text2Knowledge ... Yong Huang 2002