Complement receptors on the surface of leukocytes bind complement proteins Phagocytic receptors:CR1,CR3,CR4 present on neutrophils,monocytes, macrophages,dendritic cells. Bind C3b C3bi that are attached to microbial surfaces (as opsonins)-> phagocytosisComplement receptors on the surface of leukocytes bind complement proteins Phagocytic receptors: CR1, CR3, CR4 - present on neutrophils, monocytes, macrophages, dendritic cells. - Bind C3b / C3bi that are attached to microbial surfaces (as opsonins) → phagocytosis