By studying the planarian flatworm, a master of regenerating missing tissue and repairing wounds, Whitehead Institute Member Peter Reddien and his lab have identified an unexpected source of position instruction: the muscle cells in the planarian body wall. "I was completely surprised. We had no idea it would be muscle," says Reddien, who is also an associate professor of biology at MIT. "Finding such a cellular system for positional control in an adult regenerative animal was unanticipated and is very informative for understanding regeneration...
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