Scientists discover the molecular heart of collective behavior

Birds flock. Fish gather in schools. Bees swarm. Even amoebae clump together in mystifyingly clever constellations. Scientists have long wondered what is happening at the cellular and molecular level to bring about this amazing coordination of so many individual animals, insects and organisms into groups. It's a choreography seen throughout nature from the large-scale to the miniscule, with synchronized movements as precise as the dance lineup of a Broadway musical.

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