Table I. List of highly connected phosphopeptides of kinases and phosphatases in the systemin induced phosphorylation clusters.

Cluster	Identifier	Kinase phosphopeptide	Type	Description	Degree
A	Solyc11g033270	S(ph)SNATVEASGLSR	Kinase	Serine/threonine-protein kinase 3	210
A	Solyc02g070260	LSS(ph)PAAQS(ph)PSVSTK	Phosphatase	Protein phosphatase 1 regulatory subunit 7	134
A	Solyc10g005640	LTNS(ph)PDVEIK	Phosphatase	Phosphatase 2C family protein	118
A	Solyc02g076780	AIS(ph)LPS(ph)SPR	Kinase	Kinase family protein	116
A	Solyc10g078390	TES(ph)GIFR	Kinase	Calcium-dependent protein kinase-like	115
A	Solyc09g072810	S(ph)FENEIR	Kinase	Receptor like kinase	110
B	Solyc04g076810	T(ph)TCGTPNYVAPEVLSHK	Kinase	CBL-interacting protein kinase 17	112
B	Solyc01g108920	NQGS(ph)PSDTCSESDHK	Kinase	Serine/threonine-protein kinase Sgk3	110
B	Solyc07g063130	DRLDS(ph)IDGK	Kinase	Cell division protein kinase 10	102
C	Solyc05g055070	GGS(ph)QTDSSISTSHFGGK	Kinase	Ethylene receptor	103
C	Solyc09g083210	SIDLFTDVSEEGLS(ph)PR	Kinase	Receptor-like protein kinase	49
C	Solyc12g010740	ENPGDS(ph)GSLVQPGHDIEK	Kinase	Receptor like kinase	44
D	Solyc11g033270	SEEVDGS(ph)SSIR	Kinase	Serine/threonine-protein kinase 3	110
D	Solyc08g014420	VTSETDFM(ox)T(ph)EY(ph)VVTR	Kinase	Mitogen-activated protein kinase 2	128
D	Solyc09g009090	S(ph)AAGTPEWM(ox)APEVLR	Kinase	Protein kinase	122