Your Query returns 3 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
U1-82.3NR_0019827227K5    U1    CR32862    U1snRNA    U1a-82Eb    snRNA:U1    snRNA:U1:82Eb   
U1-82.3NT_0337777227K5    U1    CR32862    U1snRNA    U1a-82Eb    snRNA:U1    snRNA:U1:82Eb   
U1-82.3X535427227

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

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Text2Knowledge ... Yong Huang 2002