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We have used Western blotting to investigate the presence of these proteins during the cell cycles of two different cellular systems : a continuously growing myeloid leukemic cell line , HL60 , and normal cells stimulated into cycle, phyto- hemagglutinin ( PHA )-stimulated normal human peripheral blood lymphocytes ( PBL ).
 ( cell line: phyto- hemagglutinin ( PHA )-stimulated normal human peripheral blood lymphocytes, None) , ( cell type: normal cells, None) , ( cell line: cellular systems, None) , ( cell line: HL60, None) , ( protein: PHA, None) , ( cell type: PBL, None) , ( cell line: continuously growing myeloid leukemic cell line, 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 line: phyto- hemagglutinin ( PHA )-stimulated normal human peripheral blood lymphocytes, None) , ( cell type: normal cells, None) , ( cell line: cellular systems, None) , ( cell line: HL60, None) , ( protein: PHA, None) , ( cell type: PBL, None) , ( cell line: continuously growing myeloid leukemic cell line, None) 