BMP gradients: A paradigm for morphogen-mediated developmental patterning

BMP mophogens direct growth and fate As shown in classic fate-mapping studies, tissues and organs arise from specific regions of the embryo. Work over the past few decades has identified molecular players directing this choreographed development. Bone morphogenetic proteins (BMPs) and their antagonists establish domains in developing embryos. Bier and De Robertis review historical events for key discoveries in this area. They go on to lay out the current understanding of how diffusible morphogens form gradients to subdivide germ layers into distinct territories and organize body axes, regulate growth, and maintain stem cell niches. Science , this issue 10.1126/science.aaa5838