Your Query returns 16 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
rrnA operonAF22014729459ribosomal RNA operon A   
rrnA operonAF0346192238
rrnA operonAF11655835622
rrnA operonAF252865382
rrnA operonAF07185046224
rrnA operonAF07185146224
rRNA operonAF176319131152
rrnA operonAF417938691
rrnA operonAF4016731599
rrnA operonAY102274198731
rrnA operonAF54813563612
rrnA operonAF5481372342
rrnA operonAF5481422341
rrnA operonAY24525378057
rRNA operonAF1426771404
rRNA operonNC_0046041404

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

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Text2Knowledge ... Yong Huang 2002