highly significantp < 10 −10
Despite the small size of the validation set (412 d ( P , T ) and 694 d ( P , P ) interactions), representing only 1% of the possible secondary regulatory interactions, PhosTF predicted 40% of the known d ( P , T ) and 28% of known d ( P , P ) interactions, which was highly significant ( p < 10 −10 ) when compared to the rate of predictions overall (20% and 18% respectively).