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ELI5: How do the cells of complex organisms know which direction to grow in so that they get the desired shape on a macro level?
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I was thinking about this while looking at a plant. I was wondering from where in the plant do the cells multiply to make it grow. But more interestingly, how do they know to multiply in a line stretching upwards and outwards along the stem rather than into a random blob of cells. Then I started wondering the same about animals too; how do organs know to get into that shape?
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