Your Query returns 3 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
mtrnr1NC_0023337955rnr1   
MTRNR1NC_0018079606RNR1   
MTRNR1NC_0015679913RNR1   

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

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Text2Knowledge ... Yong Huang 2002