Crystal structure of cholesteryl ester transfer protein reveals a long tunnel and four bound lipid molecules. - Qiu X; Mistry A; Ammirati MJ; Chrunyk BA; Clark RW; Cong Y; Culp JS; Danley DE; Freeman TB; Geoghegan KF; Griffor MC; Hawrylik SJ; et al. (Nature structural & molecular biology, 2007)