The echinoderms have the defence mechanism to distinguish different foreign objects and express variable effective defence mechanisms after a variety of non-self challenges.The coelomocytes of echinoderms can phagocytize,entrap and encapsulate invading microorganisms through valid immune cell-mediated mechanism.The process that phagocytized bacteria,discharged cellular materials and disintergrating granular cells can provoke the cellular encapsulation reaction of echinoderms.Lysozyme,hemolysis,lectin and co...