Figure 2.

Approximate Mn^{2 +} and Zn²⁺ toxicity ranges (see text for details). Low concentrations of Mn^{2 +} and Zn²⁺ are not toxic. Notably, Zn²⁺ in concentrations lower than 50 μM inhibits Mn²⁺-induced toxicity, and Zn²⁺ in concentrations higher than 100 μM potentiates Mn²⁺ toxicity [73].