7489
Activation of T lymphocytes to produce cytokines is regulated by the counterbalance of protein- tyrosine kinases and protein- tyrosine phosphatases, many of which have a high degree of substrate specificity because of physical association with their targets.
 ( protein: protein- tyrosine kinases, None) , ( cell type: T lymphocytes, None) , ( protein: cytokines, 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: protein- tyrosine kinases, None) , ( cell type: T lymphocytes, None) , ( protein: cytokines, None) 