Haploinsufficient phenotypes in Bmp4 heterozygous null mice and modification by mutations in Gli3 and Alx4

Bone morphogenetic protein 4 (Bmp4), a vertebrate homolog of Drosophila decapentaplegic (dpp), encodes a signaling protein with multiple functions during embryogenesis. Most mouse embryos homozygous for the Bmp4(tm1blh) null allele die around the time of gastrulation, with little or no mesoderm. Two...

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