Your Query returns 3 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
U3snRNANR_0016007227K7    dU3    snRNA2    snRNA3    CR31927    snRNA:U3    U3snRNA22A    snRNA[[2]]    snRNA:U3:22A   
U3snRNANT_0337797227K7    dU3    snRNA2    snRNA3    CR31927    snRNA:U3    U3snRNA22A    snRNA[[2]]    snRNA:U3:22A   
U3snRNAAL1217704896

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

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Text2Knowledge ... Yong Huang 2002