Degradation of C3b by Factor 1 Bacterium C3h Cr1 receptor n of C3b by Factor 1 ion of C3b by Factor 1 C3c Discharges Jpsoniztion terminates Opsonization.Facilitated phagocytosis is referred to as opsonization.In this sonin.This process occurs by becoming coated with C3b or C4b.This leads to binding of bacteria to phagocyte C3 receptors and the subsequent clearance of the bacteria by phagocytosis.It can either take place in the presence or absence of antibodies.Opsonization. Facilitated phagocytosis is referred to as opsonization. In this process, C3b, which coats the particle, is known as an opsonin. This process occurs when cells, viruses, or immune complexes are made ready for enhanced phagocytosis by becoming coated with C3b or C4b. This leads to binding of bacteria to phagocyte C3 receptors and the subsequent clearance of the bacteria by phagocytosis. It can either take place in the presence or absence of antibodies