1.13.11.77	Fe2+	the enzyme contains 0.55 mol of Fe2+ per mol of protein	723962	
1.13.11.77	Mg2+	the presence of 1 mM Mg2+ increases enzyme activity 1.5fold	723962	
1.13.11.77	Mn2+	the enzyme contains 25 mmol Mn2+ per mol of protein	723962