Table 1.

Selected protein kinases, their class, the number of known protein substrates and the instances recorded in Phospho.ELM.

Kinase	Type	Substrates	Instances
CK2	Ser/Thr kinase	54	138
PKA	Ser/Thr kinase	88	170
PDKI	Ser/Thr kinase	12	17
Src	non-receptor Tyr Kinase	40	69
Abl	non-receptor Tyr Kinase	14	21
FAK	non-receptor Tyr Kinase	7	11
IR	receptor Tyr Kinase	11	36
EGFR	receptor Tyr Kinase	19	43