Your Query returns 2 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
snoH1NR_0019117227H1    Dm-639    CR32884    snoR639    snoRNA:H1   
snoH1NT_0337787227H1    Dm-639    CR32884    snoR639    snoRNA:H1   

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

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Text2Knowledge ... Yong Huang 2002