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:	S538
P-Site Sequence:	VYNDSRVSPVSENQV
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	S538	VYNDSRVSPVSENQV	100 / 9 AA	63
Phosphosite 1:	SDCCAG3	Q96C92	S240	SDTDSRVSPASPAGS	87 / 8 AA	48
Phosphosite 2:	FBXW9	Q5XUX1	S72	PRAASRVSAVSEPGL	87 / 8 AA	54
Phosphosite 3:	TACC3	Q9Y6A5	T196	YSLDRRVTPASETLE	66 / 9 AA	90
Phosphosite 4:	ZNF462	Q96JM2	S2172	ARNNSRVSPVPLSGA	85 / 7 AA	285
Phosphosite 5:	Putative uncharacterized protein FLJ45035	Q6ZQT0	S66	SEMFGRLSPVSETFG	75 / 8 AA	15
Phosphosite 6:	Putative uncharacterized protein FLJ45035	Q6ZQT0	S106	SETFGRLSPVSEMFG	75 / 8 AA	15
Phosphosite 7:	NHS	Q6T4R5	S1397	PSDDSIISPLSEDSQ	66 / 9 AA	177
Phosphosite 8:	Kv1.6	P17658	S215	NGGVSRVSPVSRGSQ	100 / 7 AA	59
Phosphosite 9:	MYO9B	Q13459	S1258	PTSLALDSRVSPPAP	100 / 6 AA	244
Phosphosite 10:	USP21	Q9UK80	S535	GWHVYNDSRVSPVSE	100 / 6 AA	63
Phosphosite 11:	GPR155	Q7Z3F1	S741	DTAENRDSPVSEEIK	66 / 9 AA	97
Phosphosite 12:	LIMA1	Q9UHB6	S368	LSPDSRASSLSESSP	66 / 9 AA	85
Phosphosite 13:	SDCCAG3	Q96C92	S237	WALSDTDSRVSPASP	100 / 6 AA	48
Phosphosite 14:	MYO9B	Q13459	S1261	LALDSRVSPPAPGSA	100 / 6 AA	244
Phosphosite 15:	AKNA	Q7Z591	S935	GSETSRVSPLTQTPE	62 / 8 AA	155
Phosphosite 16:	MAP1B	P46821	S1443	QGSPDQVSPVSEMTS	85 / 7 AA	271
Phosphosite 17:	C22orf30	Q5THK1	S582	LMPEDQISPVSEVLK	55 / 9 AA	237
Phosphosite 18:	THRAP3	Q9Y2W1	S237	TGSASRASAVSELSP	75 / 8 AA	109
Phosphosite 19:	BBX	Q8WY36	T849	RTADGRVSPAGGTLD	62 / 8 AA	105
Phosphosite 20:	BBX	Q8WY36	S844	RTADGRVSPAGGTLD	62 / 8 AA	105