Department of Biological Sciences, Faculty of Science, National University of Singapore, Singapore.|Department of Biological Sciences, Faculty of Science, National University of Singapore, Singapore.|Department of Biological Sciences, Faculty of Science, National University of Singapore, Singapore.|Department of Biological Sciences, Faculty of Science, National University of Singapore, Singapore.|Department of Biological Sciences, Faculty of Science, National University of Singapore, Singapore.|Department of Biological Sciences, Faculty of Science, National University of Singapore, Singapore.|Department of Biological Sciences, Faculty of Science, National University of Singapore, Singapore.|Department of Biological Sciences, Faculty of Science, National University of Singapore, Singapore.