Your Query returns 6 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
BK-2NM_00974710090B2    B2R    BK2    B(2)    BK2R    BKR2    BRB2    Bdkrb2   
BK-2NM_0006239606B2R    BK2    BKR2    BRB2    BDKRB2   
BK-2M887149606
BK-2X696809606
BK-2X6968110116
BK-2X6968210090

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

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Text2Knowledge ... Yong Huang 2002