Your Query returns 28 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
bmp2NM_1313597955bmp2a   
bmp20N/Abmp-2    cb670    zbmp2    bmp2-4    zbmp-2    bmp2b   
bmp2AJ00181766310
BMP2M224899606112261
BMP2M224909606112261
BMP2M224919606112261
Bmp2NM_00755310090Bmp2a    112261
Bmp2NW_04765810116
Bmp2NM_01717810116
BMP2AL0356689606112261
BMP2AY4188129606112261
BMP2AY4188139598
BMP2AY41881410090112261
BMP2NM_0012009606BMP2A    112261
Bmp2NT_07837810090112261
Bmp2AF07494210090112261
BMP2U822337955
Bmp2AB08464940171
Bmp2AB08465064538
Bmp2AB08465150897
Bmp2AB0846528148
bmp2AF0724567955
BMP2NT_0113879606112261
BMP2NM_2043589031
BMP2AY4941889521
BMP2AH0136719534
BMP2AY4941899534
BMP2AY4941909534

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

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Text2Knowledge ... Yong Huang 2002