3.4.22.52	Ca2+	-	643983, 643987, 696451	
3.4.22.52	Ca2+	0.0044 mM required for half-maximal activity	679332	
3.4.22.52	Ca2+	0.01 mM	679333	
3.4.22.52	Mn2+	0.1 mM, less than 10% as active as Ca2+	643979	
3.4.22.52	Sr2+	0.1 mM, less than 10% as active as Ca2+	643979	
3.4.22.52	Ba2+	activates	643987	
3.4.22.52	Ca2+	activates	707364	
3.4.22.52	Mn2+	activates	643987	
3.4.22.52	Sr2+	activates	643987	
3.4.22.52	Ca2+	activates at 1.0 mM	707398