Inductive Interactions

• Interactions among ectodermal cells

• Interactions across the future endoderm-ectoderm boundary

• Specification of the veg2 lineage compartment, the definitive vegetal plate, by signals from the micromeres

• Possible signals from the A and O polar blastomeres to the lateral ectoderm

• veg1-to-veg1 signal

• veg2-to lower-veg1 signal

• veg2-to-veg2 signal

• Vegetal-to-ectoderm signal

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