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:	S43
P-Site Sequence:	KERRNPASGPNPMLR
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	S43	KERRNPASGPNPMLR	100 / 9 AA	63
Phosphosite 1:	SIPAR	Q7Z4H9	S96	SVRRNPASAATPSTA	66 / 9 AA	28
Phosphosite 2:	C9orf51	B1ANY3	S91	SARRNPASAATPSAA	66 / 9 AA	29
Phosphosite 3:	TTF-1	P43699	S109	DTMRNSASGPGWYGA	85 / 7 AA	39
Phosphosite 4:	HAUS2	Q9NVX0	S11	ANPWDPASAPNGAGL	62 / 8 AA	27
Phosphosite 5:	UTP23	Q9BRU9	S200	RKKRKKISGPNPLSC	66 / 9 AA	28
Phosphosite 6:	ADO	Q96SZ5	S37	ASDRDAASGPEAPMQ	55 / 9 AA	30
Phosphosite 7:	BEAN	Q3B7T3	S253	TPTRAPASGPERIV_	75 / 8 AA	29
Phosphosite 8:	ZNF831	Q5JPB2	S994	PLSPSPASGPSPGEA	75 / 8 AA	178
Phosphosite 9:	ERN2	Q76MJ5	S268	GHIRLPASGPQDTAT	85 / 7 AA	102
Phosphosite 10:	PNRC1	Q12796	T132	EGGRSPATGPSGAQE	62 / 8 AA	35
Phosphosite 11:	DYNC1H1	Q14204	S268	KLDRDPASGTALQEI	83 / 6 AA	532
Phosphosite 12:	ZNF211	Q13398	S30	TALRDPASGSVTFED	71 / 7 AA	65
Phosphosite 13:	CEACAM16	Q2WEN9	S415	AWYRGPASEPNRLLS	75 / 8 AA	53
Phosphosite 14:	ALLC	Q8N6M5	S167	LKPGNPASGHNYFLV	85 / 7 AA	46
Phosphosite 15:	DMAP1	Q9NPF5	S412	GGPATPASGPGPASA	75 / 8 AA	53
Phosphosite 16:	SHANK3	Q9BYB0	S1657	SPLPSPASGPGPGAP	75 / 8 AA	186
Phosphosite 17:	ARHGAP30	Q7Z6I6	S460	QHRPSPASGPGPGPG	75 / 8 AA	95
Phosphosite 18:	AGAP3	Q96P47	S521	PGMQHPASGPAEVLS	71 / 7 AA	95
Phosphosite 19:	TPRX1	Q8N7U7	S216	GPISGPISGPNPGPI	85 / 7 AA	41
Phosphosite 20:	MVP	Q14764	S864	PLGRRVASGPSPGEG	66 / 9 AA	99