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This review outlines general features of signal transduction and several aspects of cytokine networks are discussed with emphasis on: transcriptional regulation of Th1 and Th2-specific cytokine genes in T cells , the roles of cytokines and their receptors in growth and differentiation of hemopoietic cells , and the manipulation of cytokine networks .
 ( DNA: cytokine genes, None) , ( protein: cytokine networks, None) , ( cell type: T cells, None) , ( protein: cytokines, None) , ( cell type: hemopoietic cells, None) , ( protein: cytokine networks, 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:
 ( DNA: cytokine genes, None) , ( protein: cytokine networks, None) , ( cell type: T cells, None) , ( protein: cytokines, None) , ( cell type: hemopoietic cells, None) , ( protein: cytokine networks, None) 