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News Feature: The cells that flock together

Flesh really does crawl. Crowds of cells can surge forward together, form gyrating swirls and waves, segregate into types, and send off meandering tendrils or mobile exploratory clusters. Collective cell motions are crucial for everything from embryo development to wound healing to cancer metastasis. These cell colonies seem to move in concert, almost like flocks of birds, shoals of fish, or herds of wildebeest.