2.4.99.20	Cu2+	-	19	
2.4.99.20	additional information	the cyclization reaction is insensitive to free Ca2+ concentration in the range 20 nM–100 microM. Mg2+ is not inhibitory	2	
2.4.99.20	NAD+	-	7	
2.4.99.20	NADP+	-	10	
2.4.99.20	nicotinamide	inhibition of the cyclization reaction and is 30fold more potent at suppressing the base-exchange reaction. Inhibition is not via a competition with the nicotinic acid-binding site	267	
2.4.99.20	Zn2+	-	14