Noun
English Wikipedia has an article on:clathrinWikipedia
clathrin (countable and uncountable, plural clathrins)
(biochemistry) A fibrous protein that forms a polyhedral coat on the surface of the coated pits and vesicles of cells during endocytosis.
In endocytosis, the clathrin coat is assembled on the cytoplasmic face of the plasma membrane, forming pits that invaginate to pinch off (scission) and become free CCVs. Source: Internet
They are clathrin -coated, COPI -coated, and COPII -coated vesicles. Source: Internet