Evaluation of the prediction results of different species-specific predictors. (A) Distribution of AUC values for 95 species-specific predictors in the O-phosphorylation dataset and 39 species-specific predictors in the N-phosphorylation dataset. (B) AUC values of four extensively studied prokaryotic species predictors, namely, B. subtilis, E. coli, M. tuberculosis, and S. aureus. (C,D) The distribution of prediction scores for E.-coli-positive data using four species-specific predictors. (E,F) The distribution of prediction scores for B.-subtilis-positive data using four species-specific predictors.