Your Query returns 2 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
U2-34ABbNR_0016467227K6    U2    dU2    131B    D.U2-2    CR31854    U2-131B    U2-69E5    U2snRNA    snRNA:U2    snRNA:U2:34ABb   
U2-34ABbNT_0337797227K6    U2    dU2    131B    D.U2-2    CR31854    U2-131B    U2-69E5    U2snRNA    snRNA:U2    snRNA:U2:34ABb   

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

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Text2Knowledge ... Yong Huang 2002