Your Query returns 9 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Defb1NM_00784310090mBD-1    602056
Defb1NW_04747510116
DEFB1BC0476779606HBD-1    HBD1    DEFB-1    DEFB101    BD1    602056
DEFB1NM_0052189606BD1    HBD1    HBD-1    DEFB-1    DEFB101    602056
DEFB1NM_1757039913
Defb1NT_03945610090602056
Defb1BC02438010090mBD-1    602056
DEFB1NT_0237369606602056
Defb1NM_03181010116

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

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Text2Knowledge ... Yong Huang 2002