4.4.1.20	Ca2+	stimulates	644504	
4.4.1.20	Co2+	inhibits the enzyme	666794	
4.4.1.20	Mg2+	-	644499	
4.4.1.20	Mg2+	30 mM, 1.8fold stimulation of partially purified enzyme	644504	
4.4.1.20	Mg2+	augments the enzyme	666794	
4.4.1.20	Mg2+	enhances activity	644499