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Endocytosis types

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Definition

Phagocytosis (large solids), pinocytosis (fluids), receptor-mediated endocytosis (specific via clathrin-coated pits).

Endocytosis types in plain English

Endocytosis is how a cell eats — it wraps part of its outer skin (membrane) around something outside and pulls it inward as a little bubble, like a water balloon pinching off. There are three flavors: phagocytosis ("cell eating") swallows big chunky solids like bacteria, pinocytosis ("cell drinking") gulps little sips of fluid, and receptor-mediated endocytosis is the picky one — special catcher's-mitt proteins (receptors) grab only one specific molecule, then a scaffold protein called clathrin dimples the membrane inward to bring just that cargo in. The last type is why it's precise instead of random.

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