11681
This suppressive effect was also seen in IL-2 -driven cell growth of CD8-positive lymphocytes purified from 7-day PHA-blasts , indicating that CD4 molecules were not required for the suppression.
 ( cell type: CD8-positive lymphocytes, None) , ( protein: IL-2, None) , ( protein: CD4 molecules, None) , ( cell type: 7-day PHA-blasts, 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: CD8-positive lymphocytes, None) , ( protein: IL-2, None) , ( protein: CD4 molecules, None) , ( cell type: 7-day PHA-blasts, None) 