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| Organizers, Embryonic Embryonic Organizers | Hensen Node | Spemann Organizer | Embryo Organizers | Hensen' | s Node | Spemann' | s Organizer | Embryo Organizer | Embryonic Organizer | Hensens Node | Node, Hensen | Node, Hensen' | s | Organizer, Embryo The regions within an embryo that control development and differentiation. In AMPHIBIA, the organizer forms at the dorsal-most lip of the blastopore during gastrulation and is named after its discoverer, Hans Spemann. |