7468
The female steroid hormones estrogen ( E2 ) and progesterone ( Prog ) are known to modulate the reactivity of the immune system ; recently it has been demonstrated that they can regulate induction of apoptosis of endothelial cells and osteoblasts .
 ( cell type: endothelial cells, None) , ( cell type: osteoblasts, 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: endothelial cells, None) , ( cell type: osteoblasts, None) 