7671
HLA class I Ags have been implicated to play a major role in this process, since signaling via HLA class I molecules can induce the proliferation of aortic endothelial as well as smooth muscle cells .
 ( protein: HLA class I molecules, None) , ( cell type: aortic endothelial, None) , ( cell type: smooth muscle cells, None) , ( protein: HLA class I Ags, 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: HLA class I molecules, None) , ( cell type: aortic endothelial, None) , ( cell type: smooth muscle cells, None) , ( protein: HLA class I Ags, None) 