Your Query returns 5 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
mtatp6NC_0023337955ATP6   
MTATP6NC_0018079606ATP6   
MTATP6NC_0015679913ATP6   
MTATP6AY3708779606
MTATP6NM_1737029606ATP6   

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

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Text2Knowledge ... Yong Huang 2002