Your Query returns 3 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
snRNA:U1:82EbNR_0013617227
snRNA:U1:82EbNR_0019827227K5    U1    CR32862    U1-82.3    U1snRNA    U1a-82Eb    snRNA:U1   
snRNA:U1:82EbNT_0337777227K5    U1    CR32862    U1-82.3    U1snRNA    U1a-82Eb    snRNA:U1   

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

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Text2Knowledge ... Yong Huang 2002