Is it ensure, insure, or assure?
opsonization op·so·ni·za·tion (ŏp'sə-nĭ-zā'shən)
The process by which bacteria are altered by opsonins so as to become more readily and more efficiently engulfed by phagocytes.
opsonize op·so·nize (ŏp'sə-nīz')
v. op·so·nized, op·so·niz·ing, op·so·niz·es
To make bacteria or other cells more susceptible to the action of phagocytes.