“…References for the lysozyme structures we have used are as follows: hen egg-white lysozyme, 5lym (Rao & Sundaralingam, 1996), 2lzt (Ramanadham et al, 1990), 193l and194l (Vaney et al, 1996), 1lkr, 1lks (Steinrauf, 1998), 3lzt and 4lzt (Walsh et al, 1998), 1azf (Lim et al, 1998), 1lz8 and 1lz9 ; turkey egg-white lysozyme, 1tew (Howell, 1995); bob quail egg-white lysozyme, 1dkk (Chacko et al, 1996); human lysozyme, 1jka, 1jkb, 1jkc and 1jkd (Muraki et al, 1997), 1lmt (Yamada et al, 1995), 1lz5 and 1lz6 (Yamada et al, 1993) and 1lzr (Song et al, 1994). Other coordinates, kindly provided by their authors, were included in the list: water molecules and nitrate ions for the human lysozyme structure (1lz1) at 1.5 A Ê resolution (Blake et al, 1983), two hen eggwhite lysozyme structures complexed with neutral bromophenol red (BPR) and with neutral bromophenol blue (BPB) (Madhusudan & Vijayan, 1992) and three sets of HEWL coordinates studied using neutron diffraction: 1lzn (Bon et al, 1999), crystallized in dimethyl sulfoxide (Lehmann et al, 1985) and in ethanol (Lehmann & Stans®eld, 1989).…”