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:	S21
P-Site Sequence:	SQQKKKTSPLNFKKR
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	S21	SQQKKKTSPLNFKKR	100 / 9 AA	76
Phosphosite 1:	TEC	P42680	S22	SQQKKKTSPLNYKER	88 / 9 AA	74
Phosphosite 2:	Btk	Q06187	T20	RSQQKKKTSPLNFKK	100 / 8 AA	76
Phosphosite 3:	ITK	Q08881	S22	SQQKRRTSPSNFKVR	66 / 9 AA	72
Phosphosite 4:	exportin 7	Q9UIA9	T959	RSTKKRTTPLNQESD	75 / 8 AA	124
Phosphosite 5:	UBR4	Q5T4S7	S4117	SRRGKRTSPLDLKLG	62 / 8 AA	574
Phosphosite 6:	SMC2L1	O95347	S91	DNSDKKQSPLGFEVH	75 / 8 AA	136
Phosphosite 7:	NSD1	Q96L73	T317	CQPKKKSTPLKYEVG	55 / 9 AA	297
Phosphosite 8:	UBR4	Q5T4S7	T4116	LSRRGKRTSPLDLKL	71 / 7 AA	574
Phosphosite 9:	PAPOLA	P51003	T544	SPTSATKTSPLNSSG	100 / 6 AA	83
Phosphosite 10:	PAPOLA	P51003	S545	PTSATKTSPLNSSGS	100 / 6 AA	83
Phosphosite 11:	ME2	P23368	S77	RNLKKMTSPLEKYIY	75 / 8 AA	65
Phosphosite 12:	Per3	P56645	T378	IGRHKVRTSPLNEDV	75 / 8 AA	132
Phosphosite 13:	TET2	Q6N021	S1593	SDIYGSTSPMNFYST	83 / 6 AA	224
Phosphosite 14:	TDRD6	O60522	T1031	KVLLNLKTSPLNPGT	100 / 6 AA	237
Phosphosite 15:	Per3	P56645	S379	GRHKVRTSPLNEDVF	75 / 8 AA	132
Phosphosite 16:	C9orf5	Q9H330	S352	FLRKKKTSDIYFVSL	66 / 9 AA	101
Phosphosite 17:	SAV1	Q9H4B6	T26	GKYVKKETSPLLRNL	85 / 7 AA	45
Phosphosite 18:	SH3GLB1	Q9Y371	S139	DRELIQTSALNFLTP	71 / 7 AA	41
Phosphosite 19:	GLP2R	O95838	S38	PWGTSPLSFHRKCSL	83 / 6 AA	63
Phosphosite 20:	SAV1	Q9H4B6	S27	KYVKKETSPLLRNLM	85 / 7 AA	45