Cellular autophagy. Computer illustration showing the mechanism by which cells remove unnecessary or dysfunctional cellular components, known as autophagy. During this process, the target organelles are isolated from the rest of the cell within a double-membraned vesicle called an autophagosome (large, spherical). This then fuses with a lysosome, the contents of which then degrade the target organelles and their constituents are recycled.

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