<prompt> Opsonization takes place through -C3aC3bC5aC5b  <response>: The process of phagocytosis is fuher enhanced when microorganisms are coated with specific proteins, opsonins from the serum. Opsonins establish a bond between bacteria and bacteria and the membrane of the phagocytic cell. C3b is opsonin generated by activation of the implement pathway. RefReference: rush Mohan textbook of pathology, 7th edition, pg no:121 p 