1. Institute of Microbiology, Videnska 1083, 142 20 Prague 4, Czech Republic, Laboratory of Experimental Medicine, Palacky University and University Hospital, Puskinova 6, 775 20 Olomouc, Czech Republic, Department of Fundamental Sciences, Massey University, Private Bag 11222, Palmerston North 4442, New Zealand, Department of Analytical Chemistry, Palacky University, Tr. 17. Listopadu 12, Olomouc, Czech Republic, and TEVA Pharmaceuticals, Branisovska 31, 370 05 Ceske Budejovice, Czech Republic