Distances of nearest phosphosites partitioned by model organisms and non redundant sequences. Analysis of ~51,000 phosphosites was performed as in Figure 2. The data were separated according to major organisms including human, mouse, Drosophila, Arabidodpsis and yeast. In all organisms, 32-37% of the pS/pT sites are within a distance smaller than 3. The data from UniRf90 show the reduction of UniProtKB phosphoproteins to a non-redundant set in which no two proteins share more than 90% sequence identity. Results from the non-redundant set (UniRef90) are identical to the complete set.