4294
The regulation of transcription factors belonging to the signal transducer and activator of transcription (STAT) family was analyzed in PHA-activated mononuclear cells and in purified T cells activated by cross-linking cell surface CD3 .
 ( protein: signal transducer and activator of transcription (STAT) family, None) , ( protein: transcription factors, None) , ( cell line: PHA-activated mononuclear cells, None) , ( protein: cell surface CD3, None) , ( cell line: purified 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: signal transducer and activator of transcription (STAT) family, None) , ( protein: transcription factors, None) , ( cell line: PHA-activated mononuclear cells, None) , ( protein: cell surface CD3, None) , ( cell line: purified T cells, None) 