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:	S541
P-Site Sequence:	DSRVSPVSENQVASS
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	S541	DSRVSPVSENQVASS	100 / 9 AA	63
Phosphosite 1:	MYCBPAP	Q8TBZ2	S659	PRFRSPISETQVPRP	75 / 8 AA	108
Phosphosite 2:	OBFC2B	Q9BQ15	S147	PSAASPASENQNGNG	75 / 8 AA	22
Phosphosite 3:	QSER1	Q2KHR3	S438	SQGLSPVSQTQVSYS	66 / 9 AA	190
Phosphosite 4:	RBMS1	P29558	S297	PYIASPVSAYQVQSP	75 / 8 AA	45
Phosphosite 5:	SCXA	Q7RTU7	S23	YPEVSPLSEDEDRGS	62 / 8 AA	22
Phosphosite 6:	KIF1C	O43896	S131	EDLFSRVSENQSAQL	85 / 7 AA	123
Phosphosite 7:	TBC1D1	Q86TI0	S1075	LIDSSPLSDNQRMDK	71 / 7 AA	133
Phosphosite 8:	CXorf62	Q8N2A0	S104	GSSNSPVSASQVAET	75 / 8 AA	18
Phosphosite 9:	PAK1	Q13153	S174	TPAVPPVSEDEDDDD	62 / 8 AA	61
Phosphosite 10:	MYCBPAP	Q8TBZ2	T661	FRSPISETQVPRPEN	71 / 7 AA	108
Phosphosite 11:	DENND1B	Q6P3S1	S61	PFDVERVSQNQVGQH	66 / 9 AA	48
Phosphosite 12:	TNK2	Q07912	S522	KPTYDPVSEDQDPLS	83 / 6 AA	115
Phosphosite 13:	TRAK2	O60296	S760	KVYHSPISENPLQPL	62 / 8 AA	101
Phosphosite 14:	NMDAR2C	Q14957	S581	FEYFSPVSYNQNLTR	85 / 7 AA	135
Phosphosite 15:	MAP1B	P46821	S1446	PDQVSPVSEMTSTSL	100 / 6 AA	271
Phosphosite 16:	ARHGEF10	O15013	S207	SSEEPPTSEDQVGRE	62 / 8 AA	152
Phosphosite 17:	USP21	Q9UK80	S538	VYNDSRVSPVSENQV	100 / 6 AA	63
Phosphosite 18:	C13orf18	Q9H714	T286	VLQVSPVTETRTYHD	62 / 8 AA	71
Phosphosite 19:	NMDAR2C	Q14957	Y582	EYFSPVSYNQNLTRG	85 / 7 AA	135
Phosphosite 20:	MAP1B	P46821	S1443	QGSPDQVSPVSEMTS	100 / 6 AA	271