Your Query returns 3 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Bmp2aNM_00755310090Bmp2    112261
BMP2ANM_0012009606BMP2    112261
bmp2aNM_1313597955bmp2   

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

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Text2Knowledge ... Yong Huang 2002