Your Query returns 14 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
bdkrB2AF4978027955
Bdkrb2AF3349489615
BDKRB2AH0092819913
BDKRB2AF2078629913
BDKRB2AF2078609913
bdkrb2NM_1830737955
Bdkrb2NM_00974710090B2    B2R    BK2    B(2)    BK-2    BK2R    BKR2    BRB2    113503
Bdkrb2NW_04776210116
BDKRB2AY2754659606113503
BDKRB2AF3785429606113503
BDKRB2NM_0006239606B2R    BK2    BK-2    BKR2    BRB2    113503
Bdkrb2NT_03955310090113503
Bdkrb2NM_17310010116B2BKR    B2BRA   
BDKRB2NT_0264379606113503

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

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Text2Knowledge ... Yong Huang 2002