3.1.4.12	Ca2+	-	135188, 678083	
3.1.4.12	Ca2+	activated by micromolar concentrations of Ca2+ (0.0001 or 0.00001 mM) under Mg2+-free conditions, ceramide generation is dependent upon the calcium ionophore A23187, nSMase is not activated by Ca2+ cations in the presence of 1 mM Mg2+	705258	
3.1.4.12	Ca2+	activation of hemolysis at 2 mM, strong inhibition at 10 mM	651708	
3.1.4.12	Ca2+	Km: 0.0191 mM, activation of sphingomyelinase activity in the order of decreasing efficiency Co2+, Mn2+, Mg2+, Ca2+, Sr2+	665716	
3.1.4.12	Ca2+	lysosomal enzyme, stimulation at pH 5-7.5	135163	
3.1.4.12	Ca2+	partly restores the EDTA-inhibited enzyme activity	135166	
3.1.4.12	Ca2+	plays a role in enzyme regulation by non-substrate lipids	679082	
3.1.4.12	Ca2+	slight activation when water-soluble substrates are used	135157	
3.1.4.12	Ca2+	slightly activates, Km is 1.40 mM	730073	
3.1.4.12	Cd2+	-	135148