Your Query returns 3 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Atpb-1NM_00972110090Atpb    Atp1b1   
atpB-1AE012866194439CT1029   
atpB-1NC_002932194439CT1029   

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

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Text2Knowledge ... Yong Huang 2002