Your Query returns 3 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Du1AF0231604577dull1   
dU1NR_0015997227K5    U1    U14    U1a    U1-1    snRNA1    CR31656    U1-21.1    U1a-21D    U1snRNA    snRNA:U1    U1snRNA21D    snRNA:U1:21D   
dU1NT_0337797227K5    U1    U14    U1a    U1-1    snRNA1    CR31656    U1-21.1    U1a-21D    U1snRNA    snRNA:U1    U1snRNA21D    snRNA:U1:21D   

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

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Text2Knowledge ... Yong Huang 2002