Your Query returns 13 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
ATP1B1AJ4010299823
Atp1b1NM_00972110090Atpb    Atpb-1    182330
Atp1b1NW_04739810116
Atp1b1NM_01311310116ATPBS   
ATP1B1BC0000069606ATP1B    182330
ATP1B1AY4172379606182330
ATP1B1AY4172389598
ATP1B1AY41723910090182330
ATP1B1NM_0016779606ATP1B    182330
Atp1b1NT_03918510090182330
Atp1b1BC02731910090182330
ATP1B1NT_0046689606182330
ATP1B1NM_2055209031

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

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Text2Knowledge ... Yong Huang 2002