Your Query returns 3 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
BK2NM_00974710090B2    B2R    B(2)    BK-2    BK2R    BKR2    BRB2    Bdkrb2   
BK2NM_0006239606B2R    BK-2    BKR2    BRB2    BDKRB2   
BK2NM_01297010116NGK1    Kcna2   

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

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