Explain how the molecular signals that specify

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Question 1. Why does the 'four signal' model of mesoderm induction and patterning in frogs postulate two signals from vegetal cells to marginal zone cells? Cite the experimental observations that suggest that there are two signals. State the signaling molecules involved in signals 1 and 2.

Question 2. Explain how the molecular signals that specify the dorso-ventral axis are conserved between flies and frogs

Reference no: EM133418216

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