2.7.1.213	Co2+	26% activity compared to Mg2+	
2.7.1.213	KCl	300 mM, 3.6fold increase of activity	
2.7.1.213	Mg2+	required	
2.7.1.213	Mg2+	most preferred divalent metal ion	
2.7.1.213	Mn2+	68% activity compared to Mg2+	
2.7.1.213	additional information	ca2+, Ni2+, Zn2+, cu2+ show less than 20% avtivation