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:	S548
P-Site Sequence:	SENQVASSEGYVLFY
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	S548	SENQVASSEGYVLFY	100 / 9 AA	63
Phosphosite 1:	DMD	P11532	S3225	LFKQVASSTGFCDQR	66 / 9 AA	427
Phosphosite 2:	CGN	Q9P2M7	S1030	DLKTRLASSEGFQKP	62 / 8 AA	136
Phosphosite 3:	UTP14C	Q5TAP6	S478	SRKQKASSEGTVPQV	77 / 9 AA	87
Phosphosite 4:	OR2J3	O76001	S10	DDGKVNASSEGYFIL	100 / 6 AA	35
Phosphosite 5:	ZNF469	Q96JG9	S26	QPRQVASSPGHPSQP	75 / 8 AA	259
Phosphosite 6:	ZNF469	Q96JG9	S25	LQPRQVASSPGHPSQ	75 / 8 AA	259
Phosphosite 7:	FLG	P20930	S1398	SGSQVTNSEGHSEDS	62 / 8 AA	435
Phosphosite 8:	APC	P25054	S969	DSLNSVSSSDGYGKR	71 / 7 AA	312
Phosphosite 9:	APC	P25054	S970	SLNSVSSSDGYGKRG	71 / 7 AA	312
Phosphosite 10:	UTP14A	Q9BVJ6	S480	SRKQKASSEGTIPQV	66 / 9 AA	88
Phosphosite 11:	ZBTB11	O95625	S347	TAPPVASSEGTTTSL	85 / 7 AA	119
Phosphosite 12:	ZMYM2	Q9UBW7	S393	TIVAQVDSSESFQEF	62 / 8 AA	155
Phosphosite 13:	EAF2	Q96CJ1	S47	PASIDTSSEGYLEVG	71 / 7 AA	29
Phosphosite 14:	ABHD8	Q96I13	S30	PLESVESSDGYTFVE	62 / 8 AA	47
Phosphosite 15:	ABHD8	Q96I13	S29	GPLESVESSDGYTFV	71 / 7 AA	47
Phosphosite 16:	NBR1	Q14596	S729	QSQSSASSEDYIIIL	71 / 7 AA	107
Phosphosite 17:	OIT3	Q8WWZ8	Y368	LYTISEGYVPNLRNS	100 / 5 AA	60
Phosphosite 18:	FAM83B	Q5T0W9	Y433	ASSSREGYVSHHNTP	83 / 6 AA	115
Phosphosite 19:	CXorf39	Q6PEV8	S78	SCGTSVASSEGSEEL	100 / 6 AA	43
Phosphosite 20:	POLG	P54098	S64	QQPQVLSSEGGQLRH	85 / 7 AA	140