Your Query returns 9 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Atp6a1NM_00750810090VA68    VPP2    Atp6a2    Atp6v1a1   
ATP6a1NM_01692010090Vpp1    Vpp-1    Atp6n1    Atp6n1a    Atpv0a1    Atp6v0a1   
ATP6A1BC0131389606VPP2    VA68    HO68    Vma1    ATP6V1A1    ATP6V1A   
ATP6A1NM_0016909606HO68    VA68    VPP2    Vma1    ATP6V1A1    ATP6V1A   
ATP6a1BC00199510090Atpv0a1    Atp6v0a1   
ATP6a1BC06683910090Atpv0a1    Atp6v0a1   
ATP6A1AB0457759606
ATP6A1NM_1745049913
Atp6a1XM_14726710090Atp6a2   

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

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Text2Knowledge ... Yong Huang 2002