Table 1. Phosphorylation and domain-motif interaction databases.

Phosphorylation database
	LTP	HTP	Total
# phosphorylated residues	8,472	50,544	59,016
# phosphorylated proteins	2,555	8,570	9,322

Abbreviations: LTP (low throughput experimental evidence), HTP (high throughput experimental evidence).

*Counts of domain-motif interactions. Since a single motif may bind multiple domains of the same family, the non-redundant counts of domain-binding motifs were added (in parentheses).