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Our studies demonstrate that incubation of human T cells with low concentrations (approximately 1-5 nM) of calyculin A or okadaic acid , potent inhibitors of protein phosphatase type 1 (PP-1) and type 2A ( PP-2A ), induces the phosphorylation of I kappa B alpha even in the absence of any cellular stimulus.
 ( cell type: human T cells, None) , ( protein: PP-2A, None) , ( protein: I kappa B alpha, 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: human T cells, None) , ( protein: PP-2A, None) , ( protein: I kappa B alpha, None) 