The effect of calcium on superoxide production by phagocytic vesicles from rabbit alveolar macrophages. Further, microglia might be activated but hypertrophy, and fail to transform into fully phagocytic cells. It does not however obstruct the phagocytic or other defense roles of granulocytes. Protein A helps inhibit phagocytic engulfment and acts as an immunological disguise. There are four different types of blood cell&colon; lymphocytes, phagocytic amoebocytes, "nephrocytes" and "morula cells". Stossel TP, Mason RJ, Pollard TD, Vaughan M. Isolation and properties of phagocytic vesicles II. The toxin is delivered to phagocytic immune cells upon contact. This mechanism of antibody-mediated increase in phagocytic efficacy is named opsonization. The removal of dead cells by neighboring phagocytic cells has been termed efferocytosis. They play an essential role in the function of phagocytic cells. Exudate is pyogranulomatous and phagocytic cells may be packed with yeast forms. There are no specialised organs for excretion while waste is collected by phagocytic coelomocytes. The complement system and phagocytic cells are also used by most forms of invertebrate life. A phagocytic cell can even engulf other structures. Phagocytic efficacy can be enhanced by opsonization.