12831
MATERIALS AND METHODS: Lymphocyte samples were stimulated by either the mitogen phytohemagglutinin ( PHA ) or the monoclonal antibody alphaCD3 .
 ( protein: mitogen phytohemagglutinin, None) , ( protein: PHA, None) , ( cell type: Lymphocyte samples, None) , ( protein: alphaCD3, 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: mitogen phytohemagglutinin, None) , ( protein: PHA, None) , ( cell type: Lymphocyte samples, None) , ( protein: alphaCD3, None) 