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:	S446
P-Site Sequence:	RCRQKTRSTKKLTVQ
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	S446	RCRQKTRSTKKLTVQ	100 / 9 AA	63
Phosphosite 1:	USP21	Q9UK80	T447	CRQKTRSTKKLTVQR	100 / 8 AA	63
Phosphosite 2:	ANGPTL5	Q86XS5	S93	SIVSYTRSTKKLLRN	100 / 7 AA	44
Phosphosite 3:	ANGPTL5	Q86XS5	T94	IVSYTRSTKKLLRNM	100 / 7 AA	44
Phosphosite 4:	USP21	Q9UK80	T444	CDRCRQKTRSTKKLT	100 / 7 AA	63
Phosphosite 5:	TBC1D26	Q86UD7	T91	DWTKYRSTKKLSQRV	87 / 8 AA	29
Phosphosite 6:	TBC1D28	Q2M2D7	T91	DWTKYRSTKKLSQRV	87 / 8 AA	24
Phosphosite 7:	TBC1D26	Q86UD7	S90	ADWTKYRSTKKLSQR	87 / 8 AA	29
Phosphosite 8:	TBC1D28	Q2M2D7	S90	ADWTKYRSTKKLSQR	87 / 8 AA	24
Phosphosite 9:	RGS8	P57771	T98	EFKKTRSTAKLVSKA	87 / 8 AA	21
Phosphosite 10:	RGS8	P57771	S97	EEFKKTRSTAKLVSK	87 / 8 AA	21
Phosphosite 11:	ZNF174	Q15697	S321	LGHQPTRSAKKPYKC	75 / 8 AA	46
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:	C5aR	P21730	S237	WSRRATRSTKTLKVV	85 / 7 AA	39
Phosphosite 16:	SRGAP2	O75044	S80	RFLAKTRSTKDQQFK	100 / 6 AA	121
Phosphosite 17:	ARHGAP13	Q7Z6B7	T78	AERFMAKTRSTKDHQ	100 / 6 AA	124
Phosphosite 18:	C5aR	P21730	T238	SRRATRSTKTLKVVV	85 / 7 AA	39
Phosphosite 19:	SRGAP2	O75044	T81	FLAKTRSTKDQQFKK	100 / 6 AA	121
Phosphosite 20:	ARHGAP13	Q7Z6B7	T81	FMAKTRSTKDHQQYK	100 / 6 AA	124