Your Query returns 2 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
bmp2-40N/Abmp2    bmp-2    cb670    zbmp2    zbmp-2    bmp2b   
BMP2-4U822327955

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

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Text2Knowledge ... Yong Huang 2002