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:	Y555
P-Site Sequence:	SEGYVLFYQLMQEPP
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	Y555	SEGYVLFYQLMQEPP	100 / 9 AA	63
Phosphosite 1:	USP4	Q13107	Y920	KAAYVLFYQRRDDEF	100 / 6 AA	109
Phosphosite 2:	USP15	Q9Y4E8	Y930	KAAYVLFYQRQDTFS	100 / 6 AA	112
Phosphosite 3:	USP11	P51784	Y927	KAAYVLFYQRQDVAR	100 / 6 AA	110
Phosphosite 4:	RUSC2	Q8N2Y8	Y1272	GGQAGWWYQLMQSSQ	71 / 7 AA	161
Phosphosite 5:	USP46	P62068	Y362	ESGYILFYQSRE___	55 / 9 AA	42
Phosphosite 6:	USP31	Q70CQ4	Y762	QTAYILFYQRRTAIP	83 / 6 AA	147
Phosphosite 7:	ARHGAP6	O43182	Y233	RLQEVAFYQLQQDCD	75 / 8 AA	106
Phosphosite 8:	USP19	O94966	Y1211	RYAYVLFYRRRNSPV	83 / 6 AA	146
Phosphosite 9:	ILVBL	A1L0T0	Y40	AHRLGLFYQLLHKVD	71 / 7 AA	68
Phosphosite 10:	MLH3	Q9UHC1	Y153	VTVYNLFYQLPVRRK	85 / 7 AA	164
Phosphosite 11:	ZMYM4	Q5VZL5	Y811	SKYTVLFYQMAKCDA	83 / 6 AA	173
Phosphosite 12:	PUS7L	Q9H0K6	Y653	KHPCNLSYQLMEDHD	71 / 7 AA	81
Phosphosite 13:	USP15	Q9Y4E8	Y926	QIVSKAAYVLFYQRQ	100 / 5 AA	112
Phosphosite 14:	USP11	P51784	Y923	QIESKAAYVLFYQRQ	100 / 5 AA	110
Phosphosite 15:	NSMAF	Q92636	Y397	SHYSSPGYVLFYLVR	100 / 5 AA	104
Phosphosite 16:	USP33	Q8TEY7	Y708	TVQNAEAYVLFYRKS	100 / 5 AA	107
Phosphosite 17:	USP24	Q9UPU5	Y2039	WNAYMLFYQRVSDQN	83 / 6 AA	294
Phosphosite 18:	USP4	Q13107	Y916	QIVTKAAYVLFYQRR	100 / 5 AA	109
Phosphosite 19:	USP35	Q9P2H5	Y918	FFPKDTAYVLFYRQR	100 / 5 AA	113
Phosphosite 20:	MYO1D	O94832	Y205	ERSFHSFYQLLQGGS	83 / 6 AA	116