FIG. 3.

Dependence of M. jannaschii I-1-Pase activity (toward 2.5 mM I-1-P in 50 mM Tris HCl [pH 8.0] at 85°C) on Mg²⁺ concentration. The activities are normalized to the value obtained with 10 mM MgCl₂. The error bars indicate standard deviations.