Your Query returns 3 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
mtco3NC_0023337955COX3   
MTCO3NC_0018079606COX3   
MTCO3NC_0015679913COX3   

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

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Text2Knowledge ... Yong Huang 2002