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:	S431
P-Site Sequence:	TKEEELESENAPVCD
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	S431	TKEEELESENAPVCD	100 / 9 AA	63
Phosphosite 1:	NFAT3	Q14934	S37	GLGEELDSEDAPPCC	77 / 9 AA	95
Phosphosite 2:	ERCC5	P28715	S363	SSEEELESENRRQAR	100 / 7 AA	133
Phosphosite 3:	HSBP1	O75506	S66	AGVEELESENKIPAT	100 / 7 AA	9
Phosphosite 4:	PRUNE2	Q8WUY3	S1803	PSNAELDSENATVLP	85 / 7 AA	34
Phosphosite 5:	MAPRE3	Q9UPY8	S242	LICQEHESENSPVIS	66 / 9 AA	32
Phosphosite 6:	CASC1	Q6TDU7	T428	ETTEEFETENAFPPI	75 / 8 AA	83
Phosphosite 7:	FGD3	Q5JSP0	S136	DVGEEPDSENTPQKA	66 / 9 AA	79
Phosphosite 8:	MYO5A	Q9Y4I1	S1213	LKRQELESENKKLKN	85 / 7 AA	215
Phosphosite 9:	SAMSN1	Q9NSI8	S356	NGKEDLESENLSDMV	85 / 7 AA	42
Phosphosite 10:	TIGD5	Q53EQ6	S325	ASMPALDSEDAPVRC	71 / 7 AA	64
Phosphosite 11:	CMYA5	Q8N3K9	S3443	ILSEELSSESTPEDV	66 / 9 AA	449
Phosphosite 12:	GOLGB1	Q14789	S2524	SHMDDLNSENAKLDA	62 / 8 AA	376
Phosphosite 13:	CCDC41	Q9Y592	T589	AKKEELETENQVLNR	85 / 7 AA	82
Phosphosite 14:	TMCC1	O94876	S85	EPEMDLESQNACAEI	71 / 7 AA	72
Phosphosite 15:	PROCA1	Q8NCQ7	S305	ESREELESEDSYNGR	75 / 8 AA	41
Phosphosite 16:	MYH9	P35579	S1122	ELQEDLESERASRNK	66 / 9 AA	227
Phosphosite 17:	ZNF407	Q9C0G0	S668	LPLSTLESENAKESM	100 / 6 AA	247
Phosphosite 18:	NWD1	Q149M9	S1544	GAPQDLESESAQGNE	55 / 9 AA	175
Phosphosite 19:	ZNF252	Q8WUN3	S13	DISEELESQRAKSED	75 / 8 AA	79
Phosphosite 20:	HIR	P48050	S281	MGKEELESEDFEIVV	85 / 7 AA	50