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:	S490
P-Site Sequence:	KHLQIESSNNSRISD
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	S490	KHLQIESSNNSRISD	100 / 9 AA	119
Phosphosite 1:	C4orf21	Q86YA3	S489	LKHLQIESSNNSRIS	100 / 8 AA	119
Phosphosite 2:	ITSN1	Q15811	T513	QRQEIESTNKSRELR	66 / 9 AA	195
Phosphosite 3:	USP28	Q96RU2	S708	CKIPQMESSTNSSSQ	75 / 8 AA	122
Phosphosite 4:	USP28	Q96RU2	S709	KIPQMESSTNSSSQD	75 / 8 AA	122
Phosphosite 5:	CSMD2	Q7Z408	S1526	QLPGRIESSSNSLFL	75 / 8 AA	380
Phosphosite 6:	ING4	Q9UNL4	S118	LKEKQIESSDYDSSS	71 / 7 AA	29
Phosphosite 7:	ING4	Q9UNL4	S119	KEKQIESSDYDSSSS	71 / 7 AA	29
Phosphosite 8:	TRIML1	Q8N9V2	S234	KMIAQIESSSQSSAF	75 / 8 AA	53
Phosphosite 9:	CSMD2	Q7Z408	S1528	PGRIESSSNSLFLAF	85 / 7 AA	380
Phosphosite 10:	TRIML1	Q8N9V2	S235	MIAQIESSSQSSAFE	75 / 8 AA	53
Phosphosite 11:	SALL4	Q9UJQ4	S812	AGSKAESSENSRTEM	85 / 7 AA	112
Phosphosite 12:	DSPP	Q9NZW4	S189	DGPQVAGSNNSTDNE	62 / 8 AA	126
Phosphosite 13:	PPIG	Q13427	S677	DHNSSNNSREKKADR	100 / 6 AA	89
Phosphosite 14:	DSPP	Q9NZW4	S274	AGNGKDSSNNSKGQE	71 / 7 AA	126
Phosphosite 15:	C4orf21	Q86YA3	S493	QIESSNNSRISDDIT	100 / 6 AA	119
Phosphosite 16:	PPIG	Q13427	S674	KSRDHNSSNNSREKK	100 / 6 AA	89
Phosphosite 17:	DKKL1	Q9UK85	S220	LEEGTESSSHSRLSP	62 / 8 AA	27
Phosphosite 18:	ZC3HC1	Q86WB0	S290	GFQQIESSMTDLDAS	100 / 5 AA	55
Phosphosite 19:	DKKL1	Q9UK85	S221	EEGTESSSHSRLSPR	62 / 8 AA	27
Phosphosite 20:	CCDC55	Q9H0G5	S457	NQDRKESSPNSRAKD	85 / 7 AA	66