Metallothioneins (MTs), as the low molecular weight proteins rich in the active thiol groups,
whose synthesis and half-life are closely connected with the activity of zinc ions inside the cell, exert a significant influence on the antioxidant capacity of the environment within and outside the cell. MTs influence the trace elements homeostasis, contribute to the gene expression process and demonstrate the anti-apoptotic properties. They have the ability to bind and neutralize exogenous electrophilic compounds.