[1] Univ Innsbruck, Dept Physiol, A-6020 Innsbruck, Austria
[2] Univ Innsbruck, Dept Anat & Histol, A-6020 Innsbruck, Austria
[3] Univ Innsbruck, Dept Med Chem & Biochem, A-6020 Innsbruck, Austria
[4] Univ Helsinki, Inst Biotechnol, FIN-00014 Helsinki, Finland