Your Query returns 2 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
U2-38ABbNR_0016727227K6    U2    dU2    snRNA1    snRNA2    CR32878    U2snRNA    snRNA:U2    snRNA[[1]]    snRNA:U2:38ABb   
U2-38ABbNT_0337797227K6    U2    dU2    snRNA1    snRNA2    CR32878    U2snRNA    snRNA:U2    snRNA[[1]]    snRNA:U2:38ABb   

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

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Text2Knowledge ... Yong Huang 2002