Your Query returns 14 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Atp2a2BC0453277955MGC55380    zgc:55380   
Atp2a2NM_2009657955MGC55380    zgc:55380   
Atp2a2NM_00972210090SERCA2    108740
Atp2a2NW_04737510116
ATP2A2AY1865789606108740
ATP2A2BC0355889606ATP2B    SERCA2    DAR    DD    MGC45367    108740
ATP2A2NM_0016819606DD    DAR    ATP2B    SERCA2    MGC45367    108740
ATP2A2NM_1706659606DD    DAR    ATP2B    SERCA2    MGC45367    108740
Atp2a2NT_03931210090108740
Atp2a2BC05474810090SERCA2    108740
Atp2a2BC05453110090SERCA2    108740
ATP2A2G676419913
Atp2a2NM_01729010116Serca2    SercaII   
ATP2A2NT_0097759606108740

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

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Text2Knowledge ... Yong Huang 2002