Trogocytosis, from trogo meaning ‘to gnaw’ or ‘to nibble’ in Ancient Greek, is an active process during which one cell receives cell surface molecules and membrane fragments from another cell in a unidirectional and cell-contact dependent manner.  Within immune cells, trogocytosis is triggered by receptor–ligand interactions and can occur within minutes of conjugate formation between two live cells. Although the names sound similar, trogocytosis is distinct from phagocytosis, which involves complete engulfment of one cell by another. An ancient, multifunctional process The term trogocytosis was coined by Denis Hudrisier and Etienne Joly in 2002 (1). However, the first reports of...