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In both transformed and normal lymphocytes , OKA stimulation induced intense phosphorylation of the constitutively expressed Sp1 protein in the nucleus , a property of OKA not shared by TNF , phorbol ester , or PHA and interleukin 2 .
 ( protein: TNF, None) , ( protein: Sp1, None) , ( protein: Sp1 protein, None) , ( protein: interleukin 2, None) , ( protein: PHA, 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: TNF, None) , ( protein: Sp1, None) , ( protein: Sp1 protein, None) , ( protein: interleukin 2, None) , ( protein: PHA, None) 