Your Query returns 2 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
D.U2-1NR_0016457227K6    U2    dU2    131A    CR31850    U2-131A    U2snRNA    snRNA:U2    snRNA:U2:34ABa   
D.U2-1NT_0337797227K6    U2    dU2    131A    CR31850    U2-131A    U2snRNA    snRNA:U2    snRNA:U2:34ABa   

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

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Text2Knowledge ... Yong Huang 2002