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Science News:
Frogbuilding ... first the toes, then the legs: development appears out of order in coqui frog.

A small frog appears to jump-start its skeletal development, turning on genes for building feet and toes before bothering to build its legs.

While researchers are still trying to figure out how a clump of cells becomes a wing, flipper or arm, the order of developmental events has been established: The upper arm bone forms first, then the forearm, then the wrist bones and finally fingers or toes. But the new work, reported in the July/August Evolution & Development, hints that the...

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