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:	C4orf21
Human P-Site:	S431
P-Site Sequence:	NDGILSESDIQEDNK
UniProt:	Q86YA3
Intern. Prot. ID:

Protein Phosphosite Match	Human Protein Short Name	Human UniProt. ID	Phosphosite Number	Sequence	% Identity / # AA	Target Size kDa
Phosphosite 0:	C4orf21	Q86YA3	S431	NDGILSESDIQEDNK	100 / 9 AA	119
Phosphosite 1:	C4orf21	Q86YA3	S429	AENDGILSESDIQED	100 / 7 AA	119
Phosphosite 2:	PTPRZ1	P23471	S2033	QFQLLSQSNIQQSDY	55 / 9 AA	255
Phosphosite 3:	VILL	O15195	S825	REFYLSDSDFQDIFG	55 / 9 AA	96
Phosphosite 4:	DIS3	Q9Y2L1	S363	YCGMLSKSDIKESRR	66 / 9 AA	109
Phosphosite 5:	ADAM17	P78536	S48	DYDILSLSNIQQHSV	66 / 9 AA	93
Phosphosite 6:	SLFNL1	Q499Z3	S359	IQGPLSASAIQEWCR	75 / 8 AA	46
Phosphosite 7:	ATP8A1	Q9Y2Q0	S617	AVAEISESDFQEWRA	75 / 8 AA	131
Phosphosite 8:	SERPINA4	P29622	S115	NLTELSESDVHRGFQ	71 / 7 AA	49
Phosphosite 9:	NUP210L	Q5VU65	S981	ATAHLRVSDIQELEL	75 / 8 AA	211
Phosphosite 10:	ZNF227	Q86WZ6	S186	GNTYLSESQIQSRGK	85 / 7 AA	92
Phosphosite 11:	UNC13C	Q8NB66	S517	ISSQLPESDILEKQT	75 / 8 AA	251
Phosphosite 12:	HS1BP3	Q53T59	S103	KVLFVGESDIRERRA	55 / 9 AA	43
Phosphosite 13:	GTF3C1	Q12789	S478	EDTFLSESDSEEERS	66 / 9 AA	239
Phosphosite 14:	CWH43	Q9H720	S636	SHAELSDSEIQMAKF	71 / 7 AA	79
Phosphosite 15:	RBM5	P52756	S112	LPITITESDIREMME	62 / 8 AA	92
Phosphosite 16:	CIB4	A0PJX0	S149	DLTNHVLSESDLDND	71 / 7 AA	22
Phosphosite 17:	ARHGEF18	Q6ZSZ5	S768	PDLKLSDSDIPGSSE	71 / 7 AA	131
Phosphosite 18:	PMS2	P54278	S588	KEEILSSSDICQKLV	85 / 7 AA	96
Phosphosite 19:	TSNAX	Q99598	T88	PDMEDILTESEIKLD	71 / 7 AA	33
Phosphosite 20:	RGPR-p117	Q96JE7	S318	MEVILNDSEEQEEMR	55 / 9 AA	117