1. Institute of Macromolecular Chemistry AS CR, Heyrovský Sq. 2, 162 06 Prague 6, Czech Republic, Center for Cell Therapy and Tissue Repair, Charles University, V Úvalu 84, 150 06 Prague 5, Czech Republic, Institute of Experimental Medicine AS CR, Víděnská 1083, 142 20 Prague 4, Czech Republic, Institute of Clinical and Experimental Medicine, Víděnská 1958/9, 140 21 Prague 4, Czech Republic, and Institute of Physics AS CR, Cukrovarnická 10, 162 53 Prague 6, Czech Republic