Table 2. The effect of metal cations and reagents (5 mM) on the activity of recombinant Egl7A.

Chemicals	Relative activity (%) a	Chemicals	Relative activity (%)
Control	100 ± 1	Co2+	90 ± 6
Fe3+	132 ± 6	Cu2+	90 ± 5
Ca2+	119 ± 3	Na+	65 ± 5
Cr3+	114 ± 4	Pb2+	56 ± 3
K+	113 ± 2	Mn2+	44 ± 6
Li+	111 ± 1	Ag+	0
Zn2+	108 ± 4	β-mercaptoethanol	104 ± 2
Mg2+	95 ± 5	EDTA	76 ± 4
Ni2+	94 ± 4	SDS	5 ± 1

^a Values represent the mean ± SD (n = 3) relative to untreated control sample