Introduction Eph Receptor and Ephrin Families Eph Receptor/Ephrin Regulation of Axon Guidance Eph Receptor/Ephrin Mediated Control of Cell Segregation Eph Receptor/Ephrin Signalling Eph Receptor Activation by Soluble Ephrins Rapidly Stimulates the Assembly of Filamentous Actin Structures in Fibroblast Cells EphB2 and EphA7 Induced Lamellipodial Protrusion Is Mediated by the Small GTPase Rac Role of Rho GTPases in Ephrin Induced Growth Cone Collapse Conclusions References