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:	GPR21
Human P-Site:	S281
P-Site Sequence:	LESSTGHSNRFASFL
UniProt:	Q99679
Intern. Prot. ID:

Protein Phosphosite Match	Human Protein Short Name	Human UniProt. ID	Phosphosite Number	Sequence	% Identity / # AA	Target Size kDa
Phosphosite 0:	GPR21	Q99679	S281	LESSTGHSNRFASFL	100 / 9 AA	40
Phosphosite 1:	NF1	P21359	S1651	DLTHTGPSNRFKTDF	85 / 7 AA	319
Phosphosite 2:	MEKK3	Q99759	S39	KNKDTGHSNRQSDVR	100 / 6 AA	71
Phosphosite 3:	TLN1	Q9Y490	S2273	KQQLTGHSKRVAGSV	75 / 8 AA	270
Phosphosite 4:	EML6	Q6ZMW3	S150	LASATGHSDRIFDIS	62 / 8 AA	217
Phosphosite 5:	WDR34	Q96EX3	S281	WLPEPGHSHRFQVLS	83 / 6 AA	58
Phosphosite 6:	SENP1	Q9P0U3	S130	RKTSSGLSNSFAGKS	66 / 9 AA	73
Phosphosite 7:	Rap1GAP	P47736	S460	NTVSTSHSGSFAPNN	66 / 9 AA	73
Phosphosite 8:	FRG2	Q64ET8	S156	SRACTGHSKRHRSRA	71 / 7 AA	30
Phosphosite 9:	HELZ	P42694	S1628	PPSSTDHSSHFSNFN	55 / 9 AA	219
Phosphosite 10:	RFTN1	Q14699	S555	VGICTGHSNPGEDAR	71 / 7 AA	63
Phosphosite 11:	SPEF2	Q9C093	S1737	GGSEAQDSNRFASHL	83 / 6 AA	210
Phosphosite 12:	RBMY1F	Q15415	S246	AYRDNGHSNRDEHSS	83 / 6 AA	56
Phosphosite 13:	RBMY1A1	Q15414	S246	AYRDNGHSNRDEHSS	83 / 6 AA	56
Phosphosite 14:	RBMY1D	P0C7P1	S246	AYRDNGHSNRDEHSS	83 / 6 AA	56
Phosphosite 15:	RBMY1E	A6NEQ0	S246	AYRDNGHSNRDEHSS	83 / 6 AA	56
Phosphosite 16:	RBMY1B	A6NDE4	S246	AYRDNGHSNRDEHSS	83 / 6 AA	56
Phosphosite 17:	KIAA1199	Q8WUJ3	S204	KSGTVIHSDRFDTYR	80 / 5 AA	153
Phosphosite 18:	ACY1	Q03154	S208	TGRPGHASRFMEDTA	66 / 6 AA	46
Phosphosite 19:	TNRC5	Q9BT09	S119	LHKERTGSNRFAKGM	100 / 5 AA	31
Phosphosite 20:	LHX4	Q969G2	T270	ILSELGHTNRIYGNV	66 / 6 AA	43