[1] Univ Zurich Irchel, Inst Vet Biochem, CH-8057 Zurich, Switzerland
[2] Inst Mol Biotechnol, Dept Biochem, D-07745 Jena, Germany
[3] Univ Oulu, Dept Biochem, FIN-90570 Oulu, Finland
[4] Univ Oulu, Bioctr, FIN-90570 Oulu, Finland
[5] Univ Joensuu, Dept Biol, FIN-80100 Joensuu, Finland