13237
Peritoneal macrophages of transgenic mice that systemically overexpress IL-4 exhibited a threefold to fourfold higher 12-lipoxygenase activity than cells prepared from control animals.
 ( cell type: macrophages, None) , ( cell type: Peritoneal macrophages, None) , ( protein: 12-lipoxygenase, None) , ( protein: IL-4, 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:
 ( cell type: macrophages, None) , ( cell type: Peritoneal macrophages, None) , ( protein: 12-lipoxygenase, None) , ( protein: IL-4, None) 