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:	T444
P-Site Sequence:	CDRCRQKTRSTKKLT
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	T444	CDRCRQKTRSTKKLT	100 / 9 AA	63
Phosphosite 1:	USP21	Q9UK80	S446	RCRQKTRSTKKLTVQ	100 / 7 AA	63
Phosphosite 2:	ERAS	Q7Z444	T219	ARSCREKTRHQKATC	66 / 9 AA	25
Phosphosite 3:	C16orf71	Q8IYS4	T110	EPGCRQNTRTKDASS	71 / 7 AA	56
Phosphosite 4:	ABHD10	Q9NUJ1	T53	LPACRQKTSLSFLNR	100 / 5 AA	34
Phosphosite 5:	ZNF701	Q9NV72	T186	RISCRPKTRISNKYR	83 / 6 AA	54
Phosphosite 6:	SYTL2	Q9HCH5	T832	SRKSRQKTRAVGKTT	62 / 8 AA	105
Phosphosite 7:	MCTP1	Q6DN14	S198	AHLCRQKSSSLPGTA	71 / 7 AA	112
Phosphosite 8:	JMJD2B	O94953	T724	PSKSRQKTRPLIPEM	71 / 7 AA	122
Phosphosite 9:	nAChRA4	P43681	S550	SATVKTRSTKAPPPH	100 / 6 AA	70
Phosphosite 10:	SRGAP2	O75044	T78	AERFLAKTRSTKDQQ	100 / 6 AA	121
Phosphosite 11:	ARHGAP13	Q7Z6B7	S80	RFMAKTRSTKDHQQY	100 / 6 AA	124
Phosphosite 12:	nAChRA4	P43681	T551	ATVKTRSTKAPPPHL	100 / 6 AA	70
Phosphosite 13:	ARHGAP13	Q7Z6B7	T81	FMAKTRSTKDHQQYK	100 / 6 AA	124
Phosphosite 14:	ARHGAP13	Q7Z6B7	T78	AERFMAKTRSTKDHQ	100 / 6 AA	124
Phosphosite 15:	RP1-199H16.1	Q5TG08	T85	KKALREKTRSSPEDK	71 / 7 AA	75
Phosphosite 16:	SRGAP2	O75044	T81	FLAKTRSTKDQQFKK	100 / 6 AA	121
Phosphosite 17:	SRGAP2	O75044	S80	RFLAKTRSTKDQQFK	100 / 6 AA	121
Phosphosite 18:	RBM23	Q86U06	S102	GRQCRHRSRSWDRRH	57 / 7 AA	49
Phosphosite 19:	OR5D13	Q8NGL4	T239	SASGRQKTFSTCASH	85 / 7 AA	35
Phosphosite 20:	FZR1	Q9UM11	T479	VFSKTRSTKVKWESV	100 / 6 AA	55