Your Query returns 2 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
1300012C06RikNM_01964210090Rpn-2    Rpn2   
1300012C06RikBC01050910090Rpn2   

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

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Text2Knowledge ... Yong Huang 2002