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  5. With respect to the ZPA, what kind of digit develops...

With respect to the ZPA, what kind of digit develops depends on how close the digit is to the source of Sonic hedgehog.

Neil Shubin
Hedgehogs, Kind, Source
Neil Shubin (2008). “Your Inner Fish: A Journey into the 3.5-Billion-Year History of the Human Body”, p.57, Vintage
With respect to the ZPA, what kind of digit develops depends on how close the digit is to the source of Sonic hedgehog.