Damien Hall1,2. 1. Laboratory of Biochemistry and Genetics, NIDDK, NIH, Bld. 8, Bethesda, MD, 20892-0830, USA. damien.hall@nih.gov. 2. Institute for Protein Research, Osaka University, 3-1-Yamada-oka, Suita, Osaka, 565-0871, Japan. damien.hall@nih.gov.