For example you have a cell or already a bunch of cells. Those cell(s) divide and after several week you have a grown organism, for example a human with limbs, several different organs etc. However, how do cells know where up, down, left, right etc. is? I know left and right can be defined clearly in physics, for example by the Wu experiment verifying parity violation really occur.
However how do cells define those directions? What are the mechanisms for them to grow into a certain direction and tell other cells to attain a certain property?
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