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Thanks for another fascinating essay. You deserve a big hand!

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I hope I nailed it!

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This was very helpful for this reader, who knew only the broadest outlines of the picture. Has anyone studied Hox moderated processes in non tetrapods, like the mollusca?

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It seems likely they have, but I don't follow this literature. Of course, fruit flies are not tetrapods and there is a lot (boxes) of research on their hox processes.

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