1.14.11.28	Fe2+	activates, required	
1.14.11.28	Fe2+	1 mM added to cell extracts, 60% inhibition without addition of Fe2+	
1.14.11.28	Fe2+	1 mM added to cell extracts, 85% inhibition without addition of Fe2+	
1.14.11.28	Fe2+	1 mM added to cell extracts, complete inhibition without addition of Fe2+	
1.14.11.28	Fe2+	strictly required	
1.14.11.28	Fe2+	strictly required, optimal stimulation at 1 mM