When fins became limbs -- Nature

Wonder if it's possible to find a "transitional" form molecule.

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6 April 2006
When fins became limbs
The transition between fishes and limbed vertebrates, or tetrapods, occurred over 370 million years ago and required changes to virtually the entire body. Sensational fossil finds, and reinterpretations of old ones, have radically altered thinking on this topic in the past 20 years...
http://www.nature.com/nature/journal/v440/n7085/edsumm/e060406-01.html

Similar also to the famous Archaeoptryx:
http://en.wikipedia.org/wiki/Archaeoptryx

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