bookmark Crysf Permits to select feasible target proteins from UniProt for structural determination. Crysf predicts crystallization propensities (CPs) based on user-submitted protein sequences of interest. It exploits the UniProt-derived functional annotations to predict the protein CP. The tool can guide structural biologists to select feasible proteins from UniProt. The predictive performance of the Crysf predictor is dependent on the quality and reliability of the functional annotations derived from the database.