1418
Since PDTC has both antioxidant and metal-ion chelating activities , we tested the effects of N-acetyl-L-cysteine ( NAC ) ( antioxidant ) or o-phenanthroline ( OP ) ( metal-ion chelator ) on the induction of apoptosis .
 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:
 None