Your Query returns 21 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
HCN2AF1551689986
Hcn2NM_00822610090HAC1    BCNG2    602781
Hcn2XM_34317010116
Hcn2NW_04777310116
HCN2AF0651649606602781
HCN2AJ1337279606602781
HCN2AJ1337289606602781
HCN2AJ1337299606602781
HCN2AJ1337309606602781
HCN2AJ1337319606602781
HCN2AJ1337329606602781
HCN2AJ1337339606602781
HCN2AJ1337349606602781
HCN2AC0055599606BCNG2    602781
HCN2NM_0011949606BCNG2    HAC-1    BCNG-2    602781
HCN2AF15516410116
HCN2AF21183710090602781
Hcn2NT_03949610090602781
HCN2AF24745110116
HCN2AY22175210141
HCN2NT_0112559606602781

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

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Text2Knowledge ... Yong Huang 2002