The best example of a morphogen is the gradient of BMP signaling that controls D-V tissue differentiation neural crest (ectoderm) somite(mesoderm) neural tube (ectoderm) notochord(mesoderm) gut cavity (lined G by endoderm) tail bud head lateral plate mesoderm endoderm and yolk eye epidermis (ectoderm) Figure 21-70. Molecular Biology of the Cell, 4th EditionThe best example of a morphogen is the gradient of BMP signaling that controls D-V tissue differentiation. Fig. 3a