Table 2. Counts of Estimated True-Positive (TP) Serine (Ser), Threonine (Thr), and Tyrosine (Tyr) Phosphosites within Sets of Various Phosphorylation Likelihood Based on (A) Combined Evidence and (B) Individual Positive Identification Evidence in PhosphoSitePlus (PSP) or PeptideAtlas (PA)a.

For each set, TP counts were derived from the FDR estimates within the set and the overall count of target amino acids in the set.