1. Latvian Institute of Organic Synthesis Aizkraukles 21 1006 Riga Latvia
2. Department of Anatomy, Physiology and Biochemistry Swedish University of Agricultural Sciences Box 7011 750 07 Uppsala Sweden
3. Institute of Biological Sciences and Biotechnology Donghua University 201620 Shanghai China
4. Department of Neurobiology Care Sciences and Society (NVS) Center for Alzheimer Research Karolinska Institutet Novum 141 57 Huddinge Sweden
5. Centre de RMN à Très Hauts Champs Institut des Sciences Analytiques (UMR 5280-CNRS, ENS Lyon, UCB Lyon 1) Université de Lyon 5 rue de la Doua 69100 Villeurbanne France