. 2013 Oct 22;14(Suppl 16):S2. doi: 10.1186/1471-2105-14-S16-S2

Table 1.

Data statistics of experimentally verified phosphorylation sites in each resource.

Data set	Data Resource	Version	Number of phosphorylation sites			Number of phosphorylated proteins

			S	T	Y
Training set	Phospho.ELM	9.0	26,136	6,316	3,118	8,690

	UniProtKB	20120711	92,221	23,289	14,337	34,040

	Combined (NR¹)	-	98,376	25,269	15,188	35,047

Independent testing set	PhosphoSitePlus	20120730	73,969	19,946	14,696	18,550

	PHOSIDA	1.0	7,391	1,300	278	2,212

	SysPTM	1.1	30,307	6,643	2,255	10,667

	HPRD	9.0	34,273	10,761	4,121	7,753

	Combined (NR¹)	-	97,753	27,421	16,531	23,813

¹NR, non-redundant.