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Contrasting influences of the organizer and induction concepts on the scientific activity of French embryologists

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Figure

Fig. 1. Formation of axial organs after association of the micromere quartet (at 8-cell stage),with a base of vegetal endoderm cells from a frog blastula
Fig. 2. Sections through secondary embryos induced after grafting a 3of marked nuclei are present in the endoderm
Fig. 3. Reconstitution of the head region induced by a labeled blast-opore dorsal lip
Fig. 4. An example of Ca transientsorientation. AP, Animal Pole; VP, Vegetal Pole. Color scale indicates lumines-ventral ectoderm

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