(untitled) - Tuske, S; Sarafianos, S G; Wang, X; Hudson, B; Sineva, E; Mukhopadhyay, J; Birktoft, J J; Leroy, O; Ismail, S; Clark, A D; Dharia, C; Napoli, A; Laptenko, O; Lee, J; Borukhov, S; Ebright, R H; Arnold, E (Cell, 2005)