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:	MARCH-X
Human P-Site:	S551
P-Site Sequence:	AEDTTLTSQPQGAPL
UniProt:	Q8NA82
Intern. Prot. ID:

Protein Phosphosite Match	Human Protein Short Name	Human UniProt. ID	Phosphosite Number	Sequence	% Identity / # AA	Target Size kDa
Phosphosite 0:	MARCH-X	Q8NA82	S551	AEDTTLTSQPQGAPL	100 / 9 AA	91
Phosphosite 1:	MARCH-X	Q8NA82	T550	EAEDTTLTSQPQGAP	100 / 8 AA	91
Phosphosite 2:	RIPK1	Q13546	S457	HQPSGLTSQPQVLYQ	100 / 6 AA	76
Phosphosite 3:	DYRK2	Q92630	T106	NKRTVLTTQPNGLTT	66 / 9 AA	67
Phosphosite 4:	SNAP29	O95721	T139	PEQNGTLTSQPNNRL	100 / 6 AA	29
Phosphosite 5:	SNAP29	O95721	S140	EQNGTLTSQPNNRLK	100 / 6 AA	29
Phosphosite 6:	POU2F1	P14859	T246	SQPSITLTSQPATPT	100 / 6 AA	76
Phosphosite 7:	POU2F1	P14859	S247	QPSITLTSQPATPTR	100 / 6 AA	76
Phosphosite 8:	SYT3	Q9BQG1	T239	PLTQQTLTSQPDPSS	100 / 6 AA	63
Phosphosite 9:	SYT3	Q9BQG1	S240	LTQQTLTSQPDPSSE	100 / 6 AA	63
Phosphosite 10:	PHLDB2	Q86SQ0	S871	PATAVLASQPQSKEH	55 / 9 AA	142
Phosphosite 11:	C1orf147	Q96MC9	T230	WRSCTTLTSKPCSRA	85 / 7 AA	30
Phosphosite 12:	MCM9	Q9NXL9	S984	TPGNQISSQPQGETK	71 / 7 AA	127
Phosphosite 13:	C1orf147	Q96MC9	S231	RSCTTLTSKPCSRAI	85 / 7 AA	30
Phosphosite 14:	CSF1	P09603	S420	LSNPSTLSAQPQLSR	62 / 8 AA	60
Phosphosite 15:	C11orf59	Q6IAA8	T112	LPPLPSLTSQPHQVL	71 / 7 AA	18
Phosphosite 16:	CSNK1G2	P78368	S347	TVHTDLPSQPQLRDK	75 / 8 AA	47
Phosphosite 17:	NOX3	Q9HBY0	T341	EWHPFTLTSAPQEDF	85 / 7 AA	65
Phosphosite 18:	RAB14	P61106	T203	APQGGRLTSEPQPQR	83 / 6 AA	24
Phosphosite 19:	PAPPA2	Q9BXP8	T1037	EIDAALLTSQPHSPL	83 / 6 AA	199
Phosphosite 20:	CHD7	Q9P2D1	S384	NTQTMHPSQPQGTYA	66 / 9 AA	336