[1] Natl Taiwan Univ, Inst Biochem Sci, Taipei 106, Taiwan
[2] Acad Sinica, Inst Biol Chem, Taipei 115, Taiwan
[3] Acad Sinica, Core Facil Protein X Ray Crystallog, Taipei 115, Taiwan
[4] Acad Sinica, Inst BioAgr Sci, Taipei 115, Taiwan
[5] Univ Lethbridge, Dept Biol Sci, Lethbridge, AB T1K 3M4, Canada
[6] Acad Sinica, Taiwan Int Grad Program, Taipei 115, Taiwan