MEMBRANE SHAPES. “In the cell there is a great variety of membrane shapes” including: flat; cylindrical tubules of 30-100 nm diameter; spheres (endocytosis, exocytosis and cell trafficking) of 40-100 nm diameter; and saddle shapes if the Golgi. “These membranes undergo relentless shape transformations, and in many cases, drastic rearrangements of membrane structures, leading to their fusion and fission.” ”
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