or_spapm.html
![original](/275780/original-1684493057.jpg?t=eyJ3aWR0aCI6MjQ2LCJvYmpfaWQiOjI3NTc4MH0%3D--29456d9266b4f9edb48d5e6fb7cfc5f01b7865be)
Lateral view on the organizing region: The Nieuwkoop center produces a singal that induces the trunk- (brown) and the head organizing region (black) within the mesoderm. The latter requires higher concentrations. Since the black region invaginates first, it forms the most anterior mesoderm (prechordal plate)
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