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:	S140
P-Site Sequence:	GELGAALSRLALRPE
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	S140	GELGAALSRLALRPE	100 / 9 AA	63
Phosphosite 1:	KCTD9	Q7L273	S231	NFSGADLSRLDLRYI	77 / 9 AA	43
Phosphosite 2:	C17orf107	Q6ZR85	S123	RDPGAALSRVAQAAG	87 / 8 AA	20
Phosphosite 3:	Peripherin	P41219	S210	DVDDATLSRLELERK	66 / 9 AA	54
Phosphosite 4:	TRIM13	O60858	S159	WRRGDALSRLDTLET	75 / 8 AA	47
Phosphosite 5:	ATP8B4	Q8TF62	S190	SELGADISRLAGFDG	75 / 8 AA	136
Phosphosite 6:	NPPA	P01160	S75	EEAGAALSPLPEVPP	75 / 8 AA	17
Phosphosite 7:	RNF26	Q9BY78	S278	REDVMRLSRLALGSE	100 / 6 AA	48
Phosphosite 8:	ADPRHL1	Q8NDY3	Y347	EDLGAALYRLSTEEK	75 / 8 AA	40
Phosphosite 9:	ZNF491	Q8N8L2	S253	KLYGKALSRLISFRR	85 / 7 AA	51
Phosphosite 10:	MALT1	Q9UDY8	T29	LAPPAGATLNRLREP	71 / 7 AA	92
Phosphosite 11:	HSFY1	Q96LI6	S384	DRSAAPHSRLALQPS	66 / 9 AA	45
Phosphosite 12:	Cdt1	Q9H211	S380	PRMEKALSQLALRSA	85 / 7 AA	60
Phosphosite 13:	HSD11B2	P80365	S70	AAGWIALSRLARPQR	100 / 6 AA	44
Phosphosite 14:	C2orf17	Q8NC44	S379	LGRPQALSRQALDSE	85 / 7 AA	58
Phosphosite 15:	NYX	Q9GZU5	S135	ARTFAALSRLRRLDL	100 / 6 AA	52
Phosphosite 16:	BAI2	O60241	S1272	STITGTLSRLSLDED	62 / 8 AA	173
Phosphosite 17:	ARMC6	Q6NXE6	S301	SELCGTLSRLAIRNE	62 / 8 AA	54
Phosphosite 18:	SPTBN1	Q01082	S1035	DQAQAILSRLAEISD	85 / 7 AA	275
Phosphosite 19:	XRCC6	P12956	S257	ETRKRALSRLKLKLN	85 / 7 AA	70
Phosphosite 20:	MPHOSPH9	Q99550	S981	DQIEAALSRMPSPGG	62 / 8 AA	116