A gash closes up and forms a scar but how does it know when to stop? How can, for example, a whole part of your liver be removed and it just grows back without filling your whole abdomen with liver tissue
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Cells that grow back to heal wounds stop by “contact inhibition”. Basically, when they feel around and see that they’re surrounded by other cells, they stop dividing. But if you make a cut in the skin, they’ve suddenly lost half their neighbors and start growing in the direction where there’s space.
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