1. Centre for Protein Technology TNO-WU, P.O. Box 8129, 6700 EV Wageningen, The Netherlands, Novozymes A/S, Bagsvaerd, Denmark, Laboratory of Food Chemistry, Department of Agrotechnology and Food Sciences, Wageningen University, Wageningen, The Netherlands, and Department of Protein Technology, TNO Nutrition and Food Research, Zeist, The Netherlands