Your Query returns 2 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Rnu1a1BC00322910090Rnu1a-1    U1A    Snrpa   
Rnu1a1NM_01578210090U1A    Rnu1a-1    Snrpa   

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

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Text2Knowledge ... Yong Huang 2002