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:	S190
P-Site Sequence:	FHMISARSSEPFYSD
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	S190	FHMISARSSEPFYSD	100 / 9 AA	63
Phosphosite 1:	USP21	Q9UK80	S191	HMISARSSEPFYSDD	100 / 8 AA	63
Phosphosite 2:	LTBP2	Q14767	S533	SNNIPARSGEPPRPL	75 / 8 AA	195
Phosphosite 3:	STXBP1	P61764	S506	YPYISTRSSASFSTT	66 / 9 AA	68
Phosphosite 4:	SLC19A2	O60779	S49	FFASLRPSEPFLTPY	75 / 8 AA	55
Phosphosite 5:	MMAA	Q8IVH4	S331	VIRISARSGEGISEM	66 / 9 AA	47
Phosphosite 6:	TBC1D9	Q6ZT07	S228	IKVSTRSSEHFFSVF	75 / 8 AA	143
Phosphosite 7:	IHH	Q14623	S75	EGKIARSSERFKELT	85 / 7 AA	45
Phosphosite 8:	IHH	Q14623	S74	YEGKIARSSERFKEL	85 / 7 AA	45
Phosphosite 9:	ZEB1	P37275	S641	AGQISVQSSEPSSPE	75 / 8 AA	124
Phosphosite 10:	ZO3	O95049	S860	APALARSSEPVQADE	100 / 6 AA	103
Phosphosite 11:	BUB1	O43683	S159	LPAQARTSEPLHNVQ	71 / 7 AA	122
Phosphosite 12:	USP34	Q70CQ2	S143	EEESSKSSDPFSLWS	62 / 8 AA	404
Phosphosite 13:	USP34	Q70CQ2	S142	TEEESSKSSDPFSLW	62 / 8 AA	404
Phosphosite 14:	C6orf152	Q86VQ0	S621	SSTISSKSSDPNSVA	62 / 8 AA	81
Phosphosite 15:	GBX1	Q14549	S328	AGNVSSRSGEPVRNP	62 / 8 AA	38
Phosphosite 16:	FIGN	Q5HY92	S415	KNSLGSRSSESFGKY	55 / 9 AA	82
Phosphosite 17:	KATNB1	Q9BVA0	S400	SRTPPRRSEPFPAPP	62 / 8 AA	72
Phosphosite 18:	RASIP1	Q5U651	S56	SSDTGSRSSEPLPPP	55 / 9 AA	103
Phosphosite 19:	FAK	Q05397	S726	GYPSPRSSEGFYPSP	75 / 8 AA	120
Phosphosite 20:	RBM11	P57052	S92	RFGSSRSSEPANQSF	85 / 7 AA	32