Your Query returns 4 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
RT1Aw2NM_01264510116RTS    MHCRTA    RT1-Aw2   
RT1Aw2BC06181710116MHCRTA    RTS    RT1-Aw2   
RT1Aw2NW_04759710116
RT1Aw2NT_07972610116

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

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Text2Knowledge ... Yong Huang 2002