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:	T447
P-Site Sequence:	CRQKTRSTKKLTVQR
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	T447	CRQKTRSTKKLTVQR	100 / 9 AA	63
Phosphosite 1:	USP21	Q9UK80	S446	RCRQKTRSTKKLTVQ	100 / 8 AA	63
Phosphosite 2:	TBC1D26	Q86UD7	T91	DWTKYRSTKKLSQRV	77 / 9 AA	29
Phosphosite 3:	TBC1D28	Q2M2D7	T91	DWTKYRSTKKLSQRV	77 / 9 AA	24
Phosphosite 4:	ANGPTL5	Q86XS5	S93	SIVSYTRSTKKLLRN	100 / 7 AA	44
Phosphosite 5:	ANGPTL5	Q86XS5	T94	IVSYTRSTKKLLRNM	100 / 7 AA	44
Phosphosite 6:	TBC1D26	Q86UD7	S90	ADWTKYRSTKKLSQR	87 / 8 AA	29
Phosphosite 7:	TBC1D28	Q2M2D7	S90	ADWTKYRSTKKLSQR	87 / 8 AA	24
Phosphosite 8:	RGS8	P57771	T98	EFKKTRSTAKLVSKA	87 / 8 AA	21
Phosphosite 9:	RGS8	P57771	S97	EEFKKTRSTAKLVSK	87 / 8 AA	21
Phosphosite 10:	ARPP-21	Q9UBL0	T402	STSSTRSTGKLSKAG	75 / 8 AA	89
Phosphosite 11:	liprin alpha 4	O75335	T164	PPLSGRSTPKLTSRS	85 / 7 AA	78
Phosphosite 12:	ARHGAP13	Q7Z6B7	S80	RFMAKTRSTKDHQQY	100 / 6 AA	124
Phosphosite 13:	nAChRA4	P43681	T551	ATVKTRSTKAPPPHL	100 / 6 AA	70
Phosphosite 14:	nAChRA4	P43681	S550	SATVKTRSTKAPPPH	100 / 6 AA	70
Phosphosite 15:	ARHGAP13	Q7Z6B7	T81	FMAKTRSTKDHQQYK	100 / 6 AA	124
Phosphosite 16:	SRGAP2	O75044	T81	FLAKTRSTKDQQFKK	100 / 6 AA	121
Phosphosite 17:	ARHGAP13	Q7Z6B7	T78	AERFMAKTRSTKDHQ	100 / 6 AA	124
Phosphosite 18:	SRGAP2	O75044	S80	RFLAKTRSTKDQQFK	100 / 6 AA	121
Phosphosite 19:	WEE2	P0C1S8	T544	THTGSRSTKRLVGGK	62 / 8 AA	63
Phosphosite 20:	SRGAP2	O75044	T78	AERFLAKTRSTKDQQ	100 / 6 AA	121