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Although the Wikipedia page on dermatographism refers to "weak membranes" it cites no source for this, and like Chris, I haven't found any mention of this in a quick look at the literature. Histamine is usually released from mast cells in response to specific stimuli by a degranulation reaction (internal vesicles fusing with the surface membrane to release ...


Cell membranes (not cell walls) are composed of a double layer of phospholipids. The lipids are orientated in the way, that the hydrophilic part of the molecule is oriented to the outside and the inside of the cell and the hydrophobic tail to the inside of the membrane. See the figure from the Wikipedia: Embedded in the bilayer are transport proteins, ...

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