FERM is the acronym for "4.1 protein (Four-point-one), Ezrin, Radixin, Moesin". FERM is a common domain found in these proteins. The main function of this domain is to bind proteins to the cell membrane. FERM domains have now been found in many cytoskeletal proteins, in which they serve as specific binding sites for other proteins or even phospholipids. The FERM domain is usually located at the N-terminus of the proteins.