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:	Y121
P-Site Sequence:	TCPSCDSYEKKPPKE
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	Y121	TCPSCDSYEKKPPKE	100 / 9 AA	18
Phosphosite 1:	IL21	Q9HBE4	S120	LTCPSCDSYEKKPPK	100 / 8 AA	18
Phosphosite 2:	HNRNPR	O43390	Y229	AVKLCDSYEIRPGKH	75 / 8 AA	71
Phosphosite 3:	ITPR2	Q14571	Y256	KFLTCDEYEKKQHIF	66 / 9 AA	308
Phosphosite 4:	TMC3	Q7Z5M5	Y898	VINECDSYKKKHLNV	75 / 8 AA	126
Phosphosite 5:	HNRNPR	O43390	S228	EAVKLCDSYEIRPGK	71 / 7 AA	71
Phosphosite 6:	USP19	O94966	Y290	AFVKNDSYEKGPDSV	85 / 7 AA	146
Phosphosite 7:	LASP1	Q14847	Y47	NMKNYKGYEKKPYCN	55 / 9 AA	30
Phosphosite 8:	KCNU1	A8MYU2	S133	DPVGSCSSYEDKTIP	75 / 8 AA	130
Phosphosite 9:	KCNU1	A8MYU2	Y134	PVGSCSSYEDKTIPI	75 / 8 AA	130
Phosphosite 10:	FSIP2	Q5CZC0	Y1900	EGILCDIYEKTLFQN	83 / 6 AA	370
Phosphosite 11:	PDCD11	Q14690	Y119	VTEICDAYTKKLNEQ	71 / 7 AA	209
Phosphosite 12:	MLH3	Q9UHC1	Y1241	EQLIIDSYEKQQAQG	62 / 8 AA	164
Phosphosite 13:	NAB1	Q13506	S112	TWLGISCSSYERSSN	71 / 7 AA	54
Phosphosite 14:	NAB1	Q13506	S113	WLGISCSSYERSSNA	71 / 7 AA	54
Phosphosite 15:	PPP1R13L	Q8WUF5	Y259	ESDLDVAYEKKPSQT	83 / 6 AA	89
Phosphosite 16:	NAB1	Q13506	Y114	LGISCSSYERSSNAR	71 / 7 AA	54
Phosphosite 17:	RSHL1	Q9H0K4	Y520	GGAGRDSYEENPDFE	55 / 9 AA	81
Phosphosite 18:	PCSK5	Q92824	Y365	TYSSGESYDKKIITT	62 / 8 AA	102
Phosphosite 19:	PCSK5	Q92824	S364	TTYSSGESYDKKIIT	62 / 8 AA	102
Phosphosite 20:	ATRX	P46100	S1076	GKGDSCDSSEDKKSK	75 / 8 AA	283