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:	S274
P-Site Sequence:	GALWHPDSCEAVNPT
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	S274	GALWHPDSCEAVNPT	100 / 9 AA	63
Phosphosite 1:	RPS4Y2	Q8TD47	S204	NRERHPGSCDVVHVK	55 / 9 AA	29
Phosphosite 2:	NFX1	Q12986	S218	VGVFHPDSSEASSRK	75 / 8 AA	124
Phosphosite 3:	NFX1	Q12986	S219	GVFHPDSSEASSRKG	85 / 7 AA	124
Phosphosite 4:	C3orf67	Q6ZVT6	S645	PAEQRPDSCESLSVQ	62 / 8 AA	76
Phosphosite 5:	IL25	Q9H293	S73	RPNRHPESCRASEDG	62 / 8 AA	20
Phosphosite 6:	ASXL1	Q8IXJ9	S1181	KEPLLPDSCETGTGL	62 / 8 AA	165
Phosphosite 7:	RALGAPA2	Q2PPJ7	S927	LTGWHPDSAAVLWRR	55 / 9 AA	211
Phosphosite 8:	WDR59	Q6PJI9	S203	GLDWHPDSEHILATS	100 / 5 AA	110
Phosphosite 9:	ZFAT1	Q9P243	S701	TITHQPDSCKAAPEH	55 / 9 AA	139
Phosphosite 10:	DUS2L	Q9NX74	S196	ERPQHPVSCEVIKAI	62 / 8 AA	55
Phosphosite 11:	OTOG	Q6ZRI0	S2299	QTRFRPDSCATTDCS	44 / 9 AA	315
Phosphosite 12:	C12orf35	Q9HCM1	S613	IQDSKPDSCEMNPNT	71 / 7 AA	195
Phosphosite 13:	GFI1	Q99684	S74	RASASPDSCEGSVCE	83 / 6 AA	45
Phosphosite 14:	PARD3	Q8TEW0	S1808	GLKREEDSCEAARHT	55 / 9 AA	151
Phosphosite 15:	LPHN3	Q9HAR2	S497	QIPALEESCEAVEAR	83 / 6 AA	162
Phosphosite 16:	SPEG	Q15772	S118	QNERGRASCEAVLTV	55 / 9 AA	354
Phosphosite 17:	CPO	Q8IVL8	S353	AKHWHSDSAGRVTSA	55 / 9 AA	43
Phosphosite 18:	NBPF15	Q8N660	S531	SCLEQPDSCQPYGSS	57 / 7 AA	78
Phosphosite 19:	NBPF10	Q6P3W6	S802	SCLEQPDSCQPYGSS	57 / 7 AA	96
Phosphosite 20:	NBPF14	Q5TI25	S462	SCLEQPDSCQPYGSS	57 / 7 AA	106