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:	S231
P-Site Sequence:	NAVLQCLSSTRPLRD
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	S231	NAVLQCLSSTRPLRD	100 / 9 AA	63
Phosphosite 1:	USP2	O75604	S286	NSILQCLSNTRELRD	87 / 8 AA	68
Phosphosite 2:	USP4	Q13107	S321	NSALQCLSNTAPLTD	77 / 9 AA	109
Phosphosite 3:	USP15	Q9Y4E8	S308	NSAIQCLSNTPPLTE	66 / 9 AA	112
Phosphosite 4:	ZNF727	A8MUV8	S138	NGIHQCLSATRSKTC	75 / 8 AA	58
Phosphosite 5:	USP17L2	Q6R6M4	T99	NASLQCLTYTPPLAN	66 / 9 AA	60
Phosphosite 6:	USP17L6	Q6QN14	T99	NASLQCLTYTPPLAN	66 / 9 AA	45
Phosphosite 7:	USP17A	Q0WX57	T99	NASLQCLTYTPPLAN	66 / 9 AA	60
Phosphosite 8:	USP17L8	P0C7I0	T99	NASLQCLTYTPPLAN	66 / 9 AA	60
Phosphosite 9:	USP17L5	A8MUK1	T99	NASLQCLTYTPPLAN	66 / 9 AA	60
Phosphosite 10:	FAM154A	Q8IYX7	T372	TEPLDCLTTTRAHYV	55 / 9 AA	55
Phosphosite 11:	ZNF238	Q99592	S15	RHLLQCLSEQRHQGF	66 / 9 AA	58
Phosphosite 12:	CXorf64	B1ATL7	S38	DMPLQCLSSKPEDDA	85 / 7 AA	32
Phosphosite 13:	C1orf222	Q69YW0	S53	SMHLDSLSSTRGRGQ	75 / 8 AA	33
Phosphosite 14:	BIRC1	Q13075	T509	FYLSLSSTRPDEGLA	85 / 7 AA	160
Phosphosite 15:	IL6ST	P40189	S737	GSSCMSSSRPSISSS	71 / 7 AA	104
Phosphosite 16:	FLJ34931	A6NGG8	S437	ARSPCLSSTSPENIT	75 / 8 AA	140
Phosphosite 17:	IL6ST	P40189	S736	GGSSCMSSSRPSISS	71 / 7 AA	104
Phosphosite 18:	IL6ST	P40189	S735	IGGSSCMSSSRPSIS	71 / 7 AA	104
Phosphosite 19:	JMJD3	O15054	T350	SHGCLPATRPPGSDL	71 / 7 AA	180
Phosphosite 20:	FLJ34931	A6NGG8	S436	EARSPCLSSTSPENI	75 / 8 AA	140