Moesin is a protein that in humans is encoded by the MSN gene.
Moesin (for membrane-organizing extension spike protein) is a member of the ERM protein family which includes ezrin and radixin. ERM proteins appear to function as cross-linkers between plasma membranes and actin-based cytoskeletons.
Moesin is localized to filopodia and other membranous protrusions that are important for cell-cell recognition and signaling and for cell movement.