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:	SMAD3
Human P-Site:	S423
P-Site Sequence:	SPSIRCSSVS_____
UniProt:	P84022
Intern. Prot. ID:	IPI00024305

Protein Phosphosite Match	Human Protein Short Name	Human UniProt. ID	Phosphosite Number	Sequence	% Identity / # AA	Target Size kDa
Phosphosite 0:	SMAD3	P84022	S423	SPSIRCSSVS_____	100 / 7 AA	48
Phosphosite 1:	SMAD3	P84022	S422	GSPSIRCSSVS____	100 / 7 AA	48
Phosphosite 2:	Smad2	Q15796	S465	SPSVRCSSMS_____	71 / 7 AA	52
Phosphosite 3:	Smad2	Q15796	S464	GSPSVRCSSMS____	71 / 7 AA	52
Phosphosite 4:	USP48	Q86UV5	S764	VRKPTRCSPVSSVGN	71 / 7 AA	119
Phosphosite 5:	RFX7	Q2KHR2	S1069	SSNFRCRSVSPAVHR	71 / 7 AA	147
Phosphosite 6:	senataxin	Q7Z333	S2289	QTEAIRCSSDWPFQP	100 / 5 AA	303
Phosphosite 7:	PLEKHH1	Q9ULM0	S278	KLLTFRCSSASWGEG	71 / 7 AA	151
Phosphosite 8:	ZNF318	Q5VUA4	S658	RFSADRCSSVDHCFS	100 / 5 AA	251
Phosphosite 9:	TBC1D4	O60343	S318	EFRSRCSSVTGVQRR	83 / 6 AA	147
Phosphosite 10:	CCDC21	Q6P2H3	S50	RSRFSRCSSVADSGD	83 / 6 AA	86
Phosphosite 11:	TBC1D4	O60343	S317	QEFRSRCSSVTGVQR	83 / 6 AA	147
Phosphosite 12:	SPATS2	Q86XZ4	S386	STRSRCSSVTSVSLS	83 / 6 AA	60
Phosphosite 13:	AMZ1	Q400G9	S143	AAASIRCSSRPSRDS	100 / 5 AA	55
Phosphosite 14:	CCDC21	Q6P2H3	S51	SRFSRCSSVADSGDT	100 / 5 AA	86
Phosphosite 15:	SPATS2	Q86XZ4	S385	YSTRSRCSSVTSVSL	83 / 6 AA	60
Phosphosite 16:	AMZ1	Q400G9	S144	AASIRCSSRPSRDSD	100 / 5 AA	55
Phosphosite 17:	ATP2A3	Q93084	S527	SVIERCSSVRVGSRT	100 / 5 AA	114
Phosphosite 18:	ATP2A3	Q93084	S526	ESVIERCSSVRVGSR	100 / 5 AA	114
Phosphosite 19:	ZNF318	Q5VUA4	S659	FSADRCSSVDHCFSA	100 / 5 AA	251
Phosphosite 20:	BOP1	Q14137	S420	SDLVRCLSVSPGGQW	71 / 7 AA	84