PAIRpred and PPiPP performance. We compare the performance of PAIRpred and PPiPP [9] using Area Under the ROC Curve (AUC) and the rank of the first positive prediction (RFPP). RFPP(p) indicates that p percent of the proteins achieve that level of performance. For example, on DBD 4.0 without post processing, the second PAIRpred prediction is part of the interface for 10% of the complexes. PAIRpred results are provided for two residue kernels: the sequence-based kernel, and for the kernel that uses all the features computed from sequence and structure.