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:	S25
P-Site Sequence:	NIQPRVGSKLPFAPR
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	S25	NIQPRVGSKLPFAPR	100 / 9 AA	63
Phosphosite 1:	Putative uncharacterized protein LOC400499	Q6ZTK2	S44	NLTRQVGSKLAFSAS	75 / 8 AA	62
Phosphosite 2:	SSX5	O60225	S15	VRRPRVGSQIPEKMQ	75 / 8 AA	22
Phosphosite 3:	TAGAP	Q8N103	S411	FPVPRVGSRLESEEA	85 / 7 AA	81
Phosphosite 4:	HSPG2	P98160	S3337	FQWSRVGSSLPGRAT	75 / 8 AA	469
Phosphosite 5:	LAMA4	Q16363	S1335	VDKSRVGSKNPTKGK	75 / 8 AA	203
Phosphosite 6:	GPR25	O00155	S256	IESTFVGSWLPFSAL	85 / 7 AA	39
Phosphosite 7:	DPP9	Q86TI2	S310	YRYPRTGSKNPKIAL	75 / 8 AA	98
Phosphosite 8:	SPHK1	Q9NYA1	S220	LPVGRVGSKTPASPV	85 / 7 AA	43
Phosphosite 9:	CD45	P08575	S663	QSIPRVFSKFPIKEA	75 / 8 AA	150
Phosphosite 10:	MBTD1	Q05BQ5	T460	LTPPRGYTKLPFKWF	66 / 9 AA	71
Phosphosite 11:	OAS3	Q9Y6K5	S381	AVYPRAGSKPPSCPA	75 / 8 AA	121
Phosphosite 12:	DNAH7	Q8WXX0	T445	SFVPRVETKLYSKWE	71 / 7 AA	461
Phosphosite 13:	ARPC1A	Q92747	S187	PASTPWGSKMPFGQL	83 / 6 AA	42
Phosphosite 14:	ARPC1B	O15143	S187	PAPTPWGSKMPFGEL	83 / 6 AA	41
Phosphosite 15:	WTIP	A6NIX2	S63	DGRSAVGSKLSWVGP	71 / 7 AA	67
Phosphosite 16:	C9orf117	Q5JU67	S446	IQLPRTGSLLPQLSD	75 / 8 AA	61
Phosphosite 17:	AGPAT1	Q99943	S186	GTRNHNGSMLPFKRG	83 / 6 AA	32
Phosphosite 18:	ALK2	Q04771	T378	GNNPRVGTKRYMAPE	83 / 6 AA	57
Phosphosite 19:	ALK1	P37023	T372	GNNPRVGTKRYMAPE	83 / 6 AA	56
Phosphosite 20:	SEC15L2	Q9Y2D4	S242	LQQPRIGSKRKSKKD	83 / 6 AA	78