12839
Receptors for the Fc portion of immunoglobulin molecules ( FcR ) present on leukocyte cell membranes mediate a large number of cellular responses that are very important in host defense, including phagocytosis , cell cytotoxicity , production and secretion of inflammatory mediators , and modulation of the immune response .
 ( protein: inflammatory mediators, None) , ( protein: Fc portion, None) , ( protein: FcR, None) , ( protein: immunoglobulin molecules, None) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
 ( protein: inflammatory mediators, None) , ( protein: Fc portion, None) , ( protein: FcR, None) , ( protein: immunoglobulin molecules, None) 