2884
The regulatory role of protein tyrosine phosphatases ( PTPases ) in this process was explored by studying the effects of a powerful PTPase inhibitor , vanadate peroxide ( pervanadate ), on the activation cascade of Jurkat human leukaemic T-cells .
 ( protein: PTPase, None) , ( protein: protein tyrosine phosphatases, None) , ( protein: PTPases, None) , ( cell line: Jurkat human leukaemic T-cells, 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: PTPase, None) , ( protein: protein tyrosine phosphatases, None) , ( protein: PTPases, None) , ( cell line: Jurkat human leukaemic T-cells, None) 