unit-membrane model The description of all the membranes of a cell (i.e. the cell membrane and membranes enclosing organelles) as having a common structure, revealed by electron microscopy as two dark bands, each about 2 nm thick, separated by a lighter band about 3.5 nm thick. Some authorities doubt that this model describes all cell membranes and that it applies to the intracellular membranes of all cell inclusions.
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