Your Query returns 3 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
U1-95.1NR_0020787227K5    U1    U1a    U1951    CR31341    DMU1951    U1snRNA    U1a-95Ca    snRNA:U1    snRNA:U1:95Ca   
U1-95.1NT_0337777227K5    U1    U1a    U1951    CR31341    DMU1951    U1snRNA    U1a-95Ca    snRNA:U1    snRNA:U1:95Ca   
U1-95.1X535437227

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

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Text2Knowledge ... Yong Huang 2002