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:	Smad4
Human P-Site:	T521
P-Site Sequence:	PRQSIKETPCWIEIH
UniProt:	Q13485
Intern. Prot. ID:	IPI00013404

Protein Phosphosite Match	Human Protein Short Name	Human UniProt. ID	Phosphosite Number	Sequence	% Identity / # AA	Target Size kDa
Phosphosite 0:	Smad4	Q13485	T521	PRQSIKETPCWIEIH	100 / 9 AA	60
Phosphosite 1:	Smad2	Q15796	T434	RRQTVTSTPCWIELH	55 / 9 AA	52
Phosphosite 2:	SMAD3	P84022	T392	RRQTVTSTPCWIELH	55 / 9 AA	48
Phosphosite 3:	SPP2	Q13103	T90	LEFSIRETTCRKDSG	62 / 8 AA	24
Phosphosite 4:	EXOSC10	Q01780	T286	LYRPIEETPCHFISS	55 / 9 AA	101
Phosphosite 5:	ANK2	Q01484	S2430	EPSPLKESPCRDSLE	50 / 8 AA	430
Phosphosite 6:	PIK3CA	P42336	T470	GSNPNKETPCLELEF	83 / 6 AA	124
Phosphosite 7:	FETUB	Q9UGM5	S214	VEYLIKESPCTKSQA	83 / 6 AA	42
Phosphosite 8:	BTBD12	Q8IY92	T1571	PQYSIMETPVLKKEL	62 / 8 AA	200
Phosphosite 9:	GANAB	Q14697	T885	DPEGHFETPIWIERV	83 / 6 AA	107
Phosphosite 10:	Smad2	Q15796	S433	YRRQTVTSTPCWIEL	50 / 8 AA	52
Phosphosite 11:	SMAD3	P84022	S391	YRRQTVTSTPCWIEL	50 / 8 AA	48
Phosphosite 12:	STK39	Q9UEW8	T237	VRKTFVGTPCWMAPE	44 / 9 AA	60
Phosphosite 13:	OSR1	O95747	T189	VRKTFVGTPCWMAPE	44 / 9 AA	58
Phosphosite 14:	ASTN1	O14525	T236	GTLSIRETPILDGYE	62 / 8 AA	145
Phosphosite 15:	TXNDC16	Q9P2K2	T662	QKYLDSFTPCWLNLK	80 / 5 AA	94
Phosphosite 16:	PRG2	P13727	T49	PEQEMEETPCRELEE	57 / 7 AA	25
Phosphosite 17:	GDA	Q9Y2T3	T191	TEESIKETERFVSEM	55 / 9 AA	51
Phosphosite 18:	CELA3B	P08861	Y158	LPNETPCYITGWGRL	83 / 6 AA	29
Phosphosite 19:	Smad5	Q99717	S431	YHRQDVTSTPCWIEI	57 / 7 AA	52
Phosphosite 20:	TTN	Q8WZ42	T19085	HKGSIKETHYMVDRC	55 / 9 AA	3816