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Human peripheral blood monocytes responded to stimulation of platelet-activating factor ( PAF ) with up-regulation of the transcript for heparin-binding epidermal growth factor-like growth factor ( HB-EGF ), a potent mitogen for vascular smooth muscle cells .
 ( protein: heparin-binding epidermal growth factor-like growth factor, None) , ( protein: platelet-activating factor, None) , ( protein: HB-EGF, None) , ( cell type: monocytes, None) , ( protein: PAF, None) , ( protein: potent mitogen, None) , ( cell type: vascular smooth muscle 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: heparin-binding epidermal growth factor-like growth factor, None) , ( protein: platelet-activating factor, None) , ( protein: HB-EGF, None) , ( cell type: monocytes, None) , ( protein: PAF, None) , ( protein: potent mitogen, None) , ( cell type: vascular smooth muscle cells, None) 