Your Query returns 2 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
MGC55380BC0453277955Atp2a2    zgc:55380   
MGC55380NM_2009657955Atp2a2    zgc:55380   

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

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Text2Knowledge ... Yong Huang 2002