Your Query returns 5 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
mtatp8NC_0023337955ATP8   
MTATP8NC_0018079606ATP8   
MTATP8NC_0015679913ATP8   
MTATP8AY3708779606
MTATP8NM_1737039606ATP8   

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

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Text2Knowledge ... Yong Huang 2002