1. Department of Neuropeptides, Mossakowski Medical Research Centre; Polish Academy of Sciences; Pawińskiego 5 02-106 Warsaw Poland
2. Faculty of Chemistry; University of Warsaw; Pasteura 1 02-093 Warsaw Poland
3. Laboratory of Chemical Synthesis, CePT, Mossakowski Medical Research Centre; Polish Academy of Sciences; Pawińskiego 5 02-106 Warsaw Poland
4. Toxicology Research Laboratory, Mossakowski Medical Research Centre; Polish Academy of Sciences; Pawińskiego 5 02-106 Warsaw Poland
5. Department of Surgical Research and Transplantology, Mossakowski Medical Research Centre; Polish Academy of Sciences; Pawińskiego 5 02-106 Warsaw Poland
6. Department of Gastroenterology and Transplantology; Central Clinical Hospital of the Ministry of the Internal Affairs in Warsaw; Wołoska 137 02-507 Warsaw Poland