Quaternary ligand binding to aromatic residues in the active-site gorge of acetylcholinesterase - Harel, M; Schalk, I; Ehret-Sabatier, L; Bouet, F; Goeldner, M; Hirth, C; Axelsen, P H; Silman, I; Sussman, J L (Proc Natl Acad Sci U S A, 1993)