Your Query returns 5 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Rpn-2NM_019642100901300012C06Rik    Rpn2   
rpn-2U398516239
rpn-2NC_0032816239C23G10.4a    C23G10.4b    CELK00815   
rpn-2NM_0659456239C23G10.4a    C23G10.4b    CELK00815   
rpn-2NM_0659466239C23G10.4a    C23G10.4b    CELK00815   

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

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Text2Knowledge ... Yong Huang 2002