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:	USP21
Human P-Site:	S74
P-Site Sequence:	ELGRGRTSGPRPRGP
UniProt:	Q9UK80
Intern. Prot. ID:	IPI00007262

Protein Phosphosite Match	Human Protein Short Name	Human UniProt. ID	Phosphosite Number	Sequence	% Identity / # AA	Target Size kDa
Phosphosite 0:	USP21	Q9UK80	S74	ELGRGRTSGPRPRGP	100 / 9 AA	63
Phosphosite 1:	USP21	Q9UK80	T73	LELGRGRTSGPRPRG	100 / 8 AA	63
Phosphosite 2:	CENPT	Q96BT3	T447	HPPRPRTTGPRPRQD	77 / 9 AA	60
Phosphosite 3:	p37 adaptor	Q14CS0	S17	GEQERRSSGPRPPSA	85 / 7 AA	37
Phosphosite 4:	ARPP-21	Q9UBL0	S342	RDGSGRTSGSRQSSS	75 / 8 AA	89
Phosphosite 5:	AlphaK1	Q96L96	T1148	VPDVEGRTPGPRSCD	85 / 7 AA	201
Phosphosite 6:	ERBB2IP	Q96RT1	T962	PNIIRGPTSGPQSAP	75 / 8 AA	158
Phosphosite 7:	CACNA1F	O60840	S1829	TYHRGRNSGPNRAQG	85 / 7 AA	221
Phosphosite 8:	ERBB2IP	Q96RT1	S963	NIIRGPTSGPQSAPQ	75 / 8 AA	158
Phosphosite 9:	USH2A	O75445	T1950	DWSRGRTTGAAPQSV	66 / 9 AA	576
Phosphosite 10:	FLN29	O14545	S470	NQLSRSTSGPRPGCQ	100 / 6 AA	65
Phosphosite 11:	FUT4	P22083	S203	EPFGGRDSAPRPPPD	75 / 8 AA	59
Phosphosite 12:	LIPN	Q5VXI9	T75	GRTHARSTGPRPVVY	55 / 9 AA	46
Phosphosite 13:	PHF1	O43189	S25	PASPAPTSGPRPRLW	75 / 8 AA	62
Phosphosite 14:	TCTN1	Q2MV58	S64	PRAPGPSSGPRPTPV	75 / 8 AA	64
Phosphosite 15:	CENPT	Q96BT3	T446	RHPPRPRTTGPRPRQ	75 / 8 AA	60
Phosphosite 16:	ITPA	Q9BY32	T136	VRLFRGRTSGRIVAP	100 / 6 AA	21
Phosphosite 17:	ITPA	Q9BY32	S137	RLFRGRTSGRIVAPR	100 / 6 AA	21
Phosphosite 18:	PABPC4	Q13310	S456	MPSAIRQSGPRPTLR	85 / 7 AA	71
Phosphosite 19:	TSNAXIP1	Q2TAA8	S317	LQEIQRTSTPRPDWT	85 / 7 AA	77
Phosphosite 20:	TSNAXIP1	Q2TAA8	T318	QEIQRTSTPRPDWTK	85 / 7 AA	77