Your Query returns 8 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
B2RNM_00974710090B2    BK2    B(2)    BK-2    BK2R    BKR2    BRB2    Bdkrb2   
B2RNM_0006239606BK2    BK-2    BKR2    BRB2    BDKRB2   
B2RAB0514229823
B2RL2759510090
B2RD1107910245
B2RX9435510243
B2RAF38013810244
B2RNC_00331010244

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

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Text2Knowledge ... Yong Huang 2002