1. Department of Cytogenetics and Plant Molecular Biology, University of Lodz, Banacha 12/16, 90‐237 Lodz, Poland, Fax: +48‐426354423
2. Department of Bioinorganic Chemistry, Medical University, Muszynskiego 1, 90‐151 Lodz, Poland, Fax: +48‐426788398
3. Department of Chemistry, University of Dortmund, Otto‐Hahn‐Strasse 6, 44227 Dortmund, Germany, Fax: +49‐2317553797