13236
In contrast, no upregulation of the lipoxygenase activity was observed when the macrophages were prepared from homozygous STAT6 -deficient mice .
 ( protein: STAT6, None) , ( protein: lipoxygenase, None) , ( cell type: macrophages, 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: STAT6, None) , ( protein: lipoxygenase, None) , ( cell type: macrophages, None) 