Your Query returns 4 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Atp8a2NM_01580310090Ib    Atpc1b    605870
ATP8A2NM_0165299606IB    ATP    ML-1    ATPIB    DKFZP434B1913    605870
Atp8a2NT_03960610090605870
ATP8A2NT_0245249606605870

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

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Text2Knowledge ... Yong Huang 2002