Most transmembrane cell-surface receptors are glycoproteins. Transmembrane receptors that mediate endocytosis are often located in clathrin coated pits. Endocytosis transforms a coated pit into a coated vesicle, which loses its coat in becoming an endosome. An example is the LDL receptor enabling endocytosis of low-density lipoprotein (LDL) carrying cholesterol.