What: "A plant cell wall is like a sweater. Sort of. Dan Cosgrove plucks at his own sweater and laughs. "It's like a fabric …" He abandons the analogy with a shrug. "A plant cell wall is made of interlinking fibers, that's clear." It's a rigid wall, responsible for both the size and the shape of the cell. And yet it has to expand to let the plant grow."

Writer: Dan Cosgrove

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Date: May 2 2013 10:50 AM