Fig. 3. The contribution of the organizer of the ES (EGO), MS (MGO) and the LS (node) stage embryo to the axial mesoderm and the neuroectoderm (ventral tissue of the forebrain and the floor plate of the neural tube) of the early-somite stage embryo. Both the EGO and the MGO contribute to the axial mesoderm and the neuroectoderm from the most anterior region to the level of the presomitic mesoderm. The node contributes to the notochord and floor plate spanning from the second to third somite to the anterior primitive streak (PS). Unbroken line, major contribution; broken line, lesser contribution. The early-somite stage embryo is shown from lateral (left) and the dorsal (right) views.
