PDB Growth in New Folds 4000 3500 500 2000 1500 1000 500 8鼠邕邕營§昌昌劉§劉員 Year structures submitted per year; new folds per year (note that PDB criteria for a new fold differ from SCOPPDB Growth in New Folds structures submitted per year; new folds per year (note that PDB criteria for a new fold differ from SCOP)