1 Department of Food Science, Institute of Health Biosciences, The University of Tokushima Graduate School, Graduate school of Nutritional Science, The University of Tokushima, Tokushima 770-8503, Japan. Electronic address: terao@nutr.med.tokushima-u.ac.jp.
2 Heinrich-Heine-Universitaet Duesseldorf, Institut fuer Biochemie und Molekularbiologie I, Postfach 101007, 40225 Duesseldorf, Germany. Electronic address: sies@uni-duesseldorf.de.