1. Department of Life Science; National Taiwan Normal University; No 88 Section 4, Ting-Chow Road Taipei 11677 Taiwan
2. Department of Life Science; Tunghai University; No. 1727, Section 4, Taiwan Boulevard Taichung 40704 Taiwan
3. Department of Biology; The University of Dayton; 300 College Park Dayton Ohio 45469-2320 USA