Note - Blast analyses are based on comparisons of the phosphosites and the bordering four amino acids on each side of these phosphosites.

Phosphosite
Human Protein:	IL21
Human P-Site:	S102
P-Site Sequence:	KLKRKPPSTNAGRRQ
UniProt:	Q9HBE4
Intern. Prot. ID:

Protein Phosphosite Match	Human Protein Short Name	Human UniProt. ID	Phosphosite Number	Sequence	% Identity / # AA	Target Size kDa
Phosphosite 0:	IL21	Q9HBE4	S102	KLKRKPPSTNAGRRQ	100 / 9 AA	18
Phosphosite 1:	IL21	Q9HBE4	T103	LKRKPPSTNAGRRQK	100 / 8 AA	18
Phosphosite 2:	CST8	O60676	S100	SDCRKPLSTNEICAI	75 / 8 AA	16
Phosphosite 3:	NPAT	Q14207	S1111	SSTLKPPSNNAIKRE	85 / 7 AA	154
Phosphosite 4:	MGC15523	Q9HBR0	S524	PEENKPPSRHAGGKA	75 / 8 AA	120
Phosphosite 5:	FAM110A	Q9BQ89	S147	TPPRPPPSTSAVRRV	75 / 8 AA	31
Phosphosite 6:	TLK1	Q9UKI8	T353	LAKRKPPTANNSQAP	71 / 7 AA	87
Phosphosite 7:	MEX3D	Q86XN8	S589	ENSRKPPSASSAPAL	55 / 9 AA	65
Phosphosite 8:	WWP2	O00308	S183	ENRHQPPSTNCFGGR	71 / 7 AA	99
Phosphosite 9:	SCAF1	Q9H7N4	S1142	LSHRKPPSSLGMTPA	83 / 6 AA	139
Phosphosite 10:	Rab13	P51153	S186	GNGNKPPSTDLKTCD	83 / 6 AA	23
Phosphosite 11:	BSN	Q9UPA5	S38	PGAGKPPSAPAGGGQ	75 / 8 AA	416
Phosphosite 12:	Rab13	P51153	T187	NGNKPPSTDLKTCDK	83 / 6 AA	23
Phosphosite 13:	GAS2L3	Q86XJ1	S660	ASIRKPPSSVKDADS	83 / 6 AA	75
Phosphosite 14:	SPTBN2	O15020	S2133	TQPRPPPSTQAPSVN	75 / 8 AA	271
Phosphosite 15:	CECR2	Q9BXF3	T1124	NAATPPSTDPGLTGG	71 / 7 AA	164
Phosphosite 16:	MAP1S	Q66K74	S567	PKPRKAPSTSHSGFP	71 / 7 AA	112
Phosphosite 17:	CCDC15	Q0P6D6	S219	VLSRKPASTGINTGI	83 / 6 AA	110
Phosphosite 18:	CECR2	Q9BXF3	S1123	QNAATPPSTDPGLTG	62 / 8 AA	164
Phosphosite 19:	AML1	Q01196	T406	PRILPPCTNASTGSA	71 / 7 AA	49
Phosphosite 20:	TBX4	P57082	S507	GCERKPPSPHLNAAN	71 / 7 AA	60