Your Query returns 2 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
BRB2NM_00974710090B2    B2R    BK2    B(2)    BK-2    BK2R    BKR2    Bdkrb2   
BRB2NM_0006239606B2R    BK2    BK-2    BKR2    BDKRB2   

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

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Text2Knowledge ... Yong Huang 2002