Your Query returns 10 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
bmp-4NM_1313427955zbmp-4    bmp4   
BMP-4AJ0050768355
BMP-4AF0424979986
BMP-4D307519606
BMP-4L4748010090
BMP-4X5684810090
BMP-4AF0587648355
Bmp-4X759159031
BMP-4AJ3151618364
BMP-4NM_2052379031

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

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Text2Knowledge ... Yong Huang 2002