Table 1. Effects of metal ions, and chemicals on the enzyme activity of Cen219.

Metals	Concentrations	Rel act.(%) ± standard deviation
Fe3+	10 mM	19.7±2.2
Ph2+	10 mM	90.5±3.0
K+	10 mM	106.2±3.2
Ca2+	10 mM	102.1±3.0
Mg2+	10 mM	88.8±2.9
Ba2+	10 mM	74.1±2.0
Cu2+	10 mM	22.9±1.9
Zn2+	10 mM	83.6±3.7
Co2+	10 mM	105.5±3.8
Hg2+	10 mM	36±2.5
Mn2+	10 mM	148±3.8