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Re: dolphin with hind flippers

(*) Somethying I found on the WWWeb suggests that a key genetic
change involves the expression of "Sonic Hedgehog": essential to
development of both fore and hind limbs, suppressed in the
hindquarters in modern Cetaceans.

Certainly. Shh is involved in all outgrowths of vertebrate body walls -- limbs, hair, feathers, scales, teeth, taste buds, everything.