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(Left) Membrane view of an animal cell with a diameter of about 50 micrometers.
(Right, top) The endoplasmic reticulum, an organelle with a size of a few hundreds nanometers, has a rather complex architecture consisting of both sheet-like and tube-like membrane structures. (Right, bottom) On the molecular scale, biomembranes consist of a lipid/protein bilayer with a thickness of about 4 nanometers. |