Your Query returns 2 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
DEFB-1BC0476779606HBD-1    HBD1    DEFB101    BD1    DEFB1   
DEFB-1NM_0052189606BD1    HBD1    HBD-1    DEFB101    DEFB1   

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

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Text2Knowledge ... Yong Huang 2002