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:	S335
P-Site Sequence:	LANGPVPSPPRRGGA
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	S335	LANGPVPSPPRRGGA	100 / 9 AA	63
Phosphosite 1:	WBP7	Q9UMN6	S582	QEPAPVPSPPRAPTP	87 / 8 AA	294
Phosphosite 2:	SYNJ1	O43426	S1063	ISEGPVPSLPIRPSR	77 / 9 AA	173
Phosphosite 3:	CNTFR	P26992	S217	VVARPVPSNPRRLEV	87 / 8 AA	41
Phosphosite 4:	RPAP1	Q9BWH6	S72	LPPALVPSPPKRARP	85 / 7 AA	153
Phosphosite 5:	BUD13	Q9BRD0	S226	RHDSPDPSPPRRARH	77 / 9 AA	71
Phosphosite 6:	BUD13	Q9BRD0	S201	RHDSPDPSPPRRPQH	77 / 9 AA	71
Phosphosite 7:	TTF-1	P43699	S158	KNMAPLPSAPRRKRR	66 / 9 AA	39
Phosphosite 8:	EDN1	P05305	S42	GGEKPTPSPPWRLRR	75 / 8 AA	24
Phosphosite 9:	TM9SF2	Q99805	S9	SARLPVLSPPRWPRL	75 / 8 AA	76
Phosphosite 10:	GAS2L1	Q99501	S429	GAQLSVPSPARRARS	85 / 7 AA	73
Phosphosite 11:	BCL2L12	Q9HB09	T117	AAGSPVPTPPRSPAQ	75 / 8 AA	37
Phosphosite 12:	C2orf14	Q9H0H9	T77	GKLGLVPTPPRIQKE	75 / 8 AA	12
Phosphosite 13:	Uncharacterized protein C2orf14-like 2	A8MVP8	T77	GKLGLVPTPPRIQKE	75 / 8 AA	12
Phosphosite 14:	Uncharacterized protein C2orf14-like 1	A6NCX1	T77	GKLGLVPTPPRIQKE	75 / 8 AA	12
Phosphosite 15:	AMBP	P02760	T24	VSAGPVPTPPDNIQV	85 / 7 AA	39
Phosphosite 16:	CASC3	O15234	S679	QQVQPKPSPPRRTPQ	87 / 8 AA	76
Phosphosite 17:	CMYA3	A4UGR9	S302	SQSPELPSPPRRLPV	85 / 7 AA	382
Phosphosite 18:	Putative speedy protein E8	Q3ZCS2	S50	SAPGVDPSPPRRSLG	77 / 9 AA	31
Phosphosite 19:	SAKS1	Q04323	S199	PEPGPVPSSPSQEPP	66 / 9 AA	33
Phosphosite 20:	SPDYE3	A6NKU9	S42	SAPGVDPSPPRRSLG	77 / 9 AA	64