1. Faculty of Biochemistry and Molecular Medicine and Biocenter Oulu, University of Oulu, Oulu90220, Finland
2. Department of Pharmaceutical Sciences, University of Perugia, Perugia06123, Italy
3. Institute of Biochemistry and Molecular Biology, RWTH Aachen University, Aachen52074, Germany
4. Department of Biotechnology, Chemistry and Pharmacy, University of Siena, SienaI-53100, Italy