Mesoderm(中胚层) cell differentiation is determined by a morphogen gradient of BMP. ventral dorsal Lateral plate Somite Notochord BMPs are members of the tGFB superfamily Fig 3bLateral plate Somite Notochord BMP signaling Mesoderm（中胚层） cell differentiation is determined by a morphogen gradient of BMP. BMPs are members of the TGFβ superfamily. ventral dorsal Fig. 3b