Your Query returns 5 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Bmp2b1NM_00755410090Bmp2b    Bmp2b-1    Bmp4    112262
BMP2B1BC0205469606BMP2B    ZYME    BMP4    112262
BMP2B1NM_0012029606ZYME    BMP2B    BMP4    112262
BMP2B1NM_1308509606ZYME    BMP2B    BMP4    112262
BMP2B1NM_1308519606ZYME    BMP2B    BMP4    112262

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

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Text2Knowledge ... Yong Huang 2002