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:	S234
P-Site Sequence:	ERQARFSSQSGETGE
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	S234	ERQARFSSQSGETGE	100 / 9 AA	40
Phosphosite 1:	GPR21	Q99679	S233	SERQARFSSQSGETG	100 / 8 AA	40
Phosphosite 2:	PEX1	O43933	S1209	IIKGRYRSQSGEDES	66 / 9 AA	143
Phosphosite 3:	GPR21	Q99679	S236	QARFSSQSGETGEVQ	100 / 7 AA	40
Phosphosite 4:	ACSBG1	Q96GR2	S307	TWTARYGSQAGDIRP	55 / 9 AA	81
Phosphosite 5:	KPTN	Q9Y664	S24	DSFTRFSSQSNVYGL	75 / 8 AA	48
Phosphosite 6:	RAD54L2	Q9Y4B4	S1311	NLTTPFTSQAGENSL	55 / 9 AA	163
Phosphosite 7:	KPTN	Q9Y664	S23	EDSFTRFSSQSNVYG	75 / 8 AA	48
Phosphosite 8:	ZNF500	O60304	S178	EEEARFSSQQPPAQL	100 / 6 AA	54
Phosphosite 9:	ZNF500	O60304	S177	LEEEARFSSQQPPAQ	100 / 6 AA	54
Phosphosite 10:	PLEKHG5	O94827	S838	FDSGPFSSQSDETSL	66 / 9 AA	117
Phosphosite 11:	COL4A3BP	Q9Y5P4	S395	DDVHRFSSQVEEMVQ	75 / 8 AA	71
Phosphosite 12:	PLEKHG5	O94827	S840	SGPFSSQSDETSLST	85 / 7 AA	117
Phosphosite 13:	SPIRE1	Q08AE8	S673	LRSIARFSSKSKSMD	85 / 7 AA	86
Phosphosite 14:	MRPS22	P82650	S55	LPRRRFSSEAAESGS	62 / 8 AA	41
Phosphosite 15:	SPIRE1	Q08AE8	S674	RSIARFSSKSKSMDK	85 / 7 AA	86
Phosphosite 16:	KRT20	P35900	S323	ETKARYSSQLANLQS	83 / 6 AA	48
Phosphosite 17:	KRT20	P35900	S322	EETKARYSSQLANLQ	83 / 6 AA	48
Phosphosite 18:	KRTHA5	Q92764	S349	AETEARYSSQLAQMQ	83 / 6 AA	50
Phosphosite 19:	K32	Q14532	S348	TESEARYSSQLAQMQ	83 / 6 AA	50
Phosphosite 20:	GFAT2	O94808	S422	DDVCFFISQSGETAD	85 / 7 AA	77