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:	Btk
Human P-Site:	S309
P-Site Sequence:	GGFIVRDSSKAGKYT
UniProt:	Q06187
Intern. Prot. ID:	IPI00029132

Protein Phosphosite Match	Human Protein Short Name	Human UniProt. ID	Phosphosite Number	Sequence	% Identity / # AA	Target Size kDa
Phosphosite 0:	Btk	Q06187	S309	GGFIVRDSSKAGKYT	100 / 9 AA	76
Phosphosite 1:	Btk	Q06187	S310	GFIVRDSSKAGKYTV	100 / 8 AA	76
Phosphosite 2:	PIK3R1	P27986	S651	GTFLVRESSKQGCYA	66 / 9 AA	84
Phosphosite 3:	TEC	P42680	S275	GGFMVRDSSQPGLYT	66 / 9 AA	74
Phosphosite 4:	PIK3R1	P27986	S652	TFLVRESSKQGCYAC	75 / 8 AA	84
Phosphosite 5:	FMO4	P31512	S505	KTRIVPDSSKPASMS	66 / 9 AA	63
Phosphosite 6:	TEC	P42680	S276	GFMVRDSSQPGLYTV	75 / 8 AA	74
Phosphosite 7:	LCP2	Q13094	S450	GTFLVRDSSKKTTTN	85 / 7 AA	60
Phosphosite 8:	ITK	Q08881	S267	GAFMVRDSRTAGTYT	66 / 9 AA	72
Phosphosite 9:	ZNF750	Q32MQ0	S387	PIPEAKDSSKAGQRD	75 / 8 AA	77
Phosphosite 10:	DNMBP	Q6XZF7	S592	EKDIVRGSSKLITEQ	85 / 7 AA	177
Phosphosite 11:	LCP2	Q13094	S451	TFLVRDSSKKTTTNP	100 / 6 AA	60
Phosphosite 12:	PSMB1	P20618	S162	VGSYQRDSFKAGGSA	85 / 7 AA	26
Phosphosite 13:	TXK	P42681	S178	GAFIVRDSRHLGSYT	66 / 9 AA	61
Phosphosite 14:	ZNF416	Q9BWM5	S581	VERPRDSSKCGKPYS	85 / 7 AA	67
Phosphosite 15:	ZNF416	Q9BWM5	S580	TVERPRDSSKCGKPY	85 / 7 AA	67
Phosphosite 16:	RAI1	Q7Z5J4	S636	APSLVKDSSKPPFSL	62 / 8 AA	203
Phosphosite 17:	C3orf19	Q6PII3	S134	ASGAHRDSQKAGERD	85 / 7 AA	54
Phosphosite 18:	BLVRB	P30043	S37	VTVLVRDSSRLPSEG	71 / 7 AA	22
Phosphosite 19:	KIAA1107	Q9UPP5	S1356	TLLLARDSSKPQGIT	62 / 8 AA	156
Phosphosite 20:	FLNB	O75369	S1448	QSFTVDSSKAGLAPL	100 / 6 AA	278