1. PLIVA-Lachema a.s., Karásek 1, 621 33 Brno, Czech Republic; Department of Immunology, Veterinary Research Institute, Hudcova 70, 621 33 Brno, Czech Republic; Department of Inorganic Chemistry, Masaryk University, Kotlářska 2, 611 37 Brno, Czech Republic; and Institute of Biophysic, The Academy of Sciences of the Czech Republic, Královopolská 135, 61265 Brno, Czech Republic