-A form of Endocytosis
-Uptake of enzymes low-density lipoproteins, iron, and insulin.
-Extracellular substances bind to specific receptor proteins in a region of coated pits, enabling the cell to ingest and concentrate specific substances (Ligands) in protein-coated vesicles.
-Ligands may simply be released inside the cell, or combined with lysosomes to digest contents.
-Receptors are recycled to the plasma membrane in vesicles.