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A researcher has found a way to show embryonic development in great detail. He has movies that show hordes of disconnected cells moving to opposite poles of the early embryo. This mass migration shows that cells react to chemical agents that diffuse throughout the tissues and it runs counter to what I've been saying about CRF's.

It should be noted, however, that early on cells need to reproduce rapidly and take positions that are not too specific. This is done so that many tissues can start their development simultaneously. You will still see mass migrations occuring after the formation of the three germ layers but you will also start to see more and more cohesive behavior.
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