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:	S499
P-Site Sequence:	FASDKAGSPVYQLYA
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	S499	FASDKAGSPVYQLYA	100 / 9 AA	63
Phosphosite 1:	C2orf56	Q7L592	S182	PLERNAGSPVYMKGV	75 / 8 AA	49
Phosphosite 2:	USP21	Q9UK80	Y502	DKAGSPVYQLYALCN	100 / 6 AA	63
Phosphosite 3:	BTG3	Q14201	S169	SSVTAAASPVYQISE	85 / 7 AA	29
Phosphosite 4:	ST8SIA4	Q92187	S62	IIRKAGSSIFQHNVE	62 / 8 AA	41
Phosphosite 5:	N4BP1	O75113	T242	EARNKAGTPVSELTK	55 / 9 AA	100
Phosphosite 6:	SLC6A16	Q9GZN6	S263	DRIEDGGSPVYSLVL	62 / 8 AA	82
Phosphosite 7:	GJD4	Q96KN9	Y45	VLAGRPVYQDEQERF	83 / 6 AA	40
Phosphosite 8:	LDB3	O75112	Y246	VDSASPVYQAVIKSQ	83 / 6 AA	77
Phosphosite 9:	BTG3	Q14201	Y172	TAAASPVYQISELIF	83 / 6 AA	29
Phosphosite 10:	LDB3	O75112	S243	DLAVDSASPVYQAVI	71 / 7 AA	77
Phosphosite 11:	PDE4DIP	Q5VU43	S1830	GDLSSGSSVYQLNSK	71 / 7 AA	130
Phosphosite 12:	PDE4DIP	Q5VU43	S1829	SGDLSSGSSVYQLNS	71 / 7 AA	130
Phosphosite 13:	MGC32065	Q8WV41	S261	LTPTHAASPVYRRYK	71 / 7 AA	65
Phosphosite 14:	ANKMY2	Q8IV38	Y262	ASDGFPVYQEKIIRE	83 / 6 AA	49
Phosphosite 15:	KIAA0586	Q9BVV6	Y637	QVYGKPVYQGHRSTL	83 / 6 AA	169
Phosphosite 16:	GARNL3	Q5VVW2	S991	PVADREGSPVSGSSP	71 / 7 AA	113
Phosphosite 17:	SPAG9	O60271	Y935	PEDLSPVYQSSNDSD	100 / 5 AA	146
Phosphosite 18:	SPAG9	O60271	S932	VQIPEDLSPVYQSSN	100 / 5 AA	146
Phosphosite 19:	C2orf56	Q7L592	Y185	RNAGSPVYMKGVTKS	83 / 6 AA	49
Phosphosite 20:	CMYA1	Q702N8	Y484	QGIGSPVYAMQDSKG	100 / 5 AA	199