a basketlike network of protein molecules that forms on the cell membrane in response to the attachment of ligands to receptors and becomes the inside surface of the coated vesicle during endocytosis.
Main Entry: clath·rin Pronunciation: 'klath-rin Function: noun : the major component protein of a cagelike polyhedral molecular arrangement that formson the cytoplasmic side of a cell's plasma membrane and coats the endocytotic vesicles which bud off from the membrane
[klath-rin] 
rɪn