Table 1. Phosphorylation and non-phosphorylation sites used in the current study.

	P-sitesa		NP-sites
	No. of initial sites	No. of final sitesb	No. of initial sites	No. of final sitesb
S	1135	613	29 425	10 798
T	265	140	22 243	9051
Y	301	136	13 035	5103

^aCombined sites from SWISS-PROT and PhosphoBase.

^bSequences with >30% identity were removed from the initial set.