Your Query returns 2 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
U1951NR_0020787227K5    U1    U1a    CR31341    DMU1951    U1-95.1    U1snRNA    U1a-95Ca    snRNA:U1    snRNA:U1:95Ca   
U1951NT_0337777227K5    U1    U1a    CR31341    DMU1951    U1-95.1    U1snRNA    U1a-95Ca    snRNA:U1    snRNA:U1:95Ca   

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

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Text2Knowledge ... Yong Huang 2002