Your Query returns 3 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
CR31850NR_0013377227snRNA:U2:34ABa   
CR31850NR_0016457227K6    U2    dU2    131A    D.U2-1    U2-131A    U2snRNA    snRNA:U2    snRNA:U2:34ABa   
CR31850NT_0337797227K6    U2    dU2    131A    D.U2-1    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