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:	PCSK4
Human P-Site:	S501
P-Site Sequence:	AQLTLSYSRRGDLEI
UniProt:	Q6UW60
Intern. Prot. ID:

Protein Phosphosite Match	Human Protein Short Name	Human UniProt. ID	Phosphosite Number	Sequence	% Identity / # AA	Target Size kDa
Phosphosite 0:	PCSK4	Q6UW60	S501	AQLTLSYSRRGDLEI	100 / 9 AA	83
Phosphosite 1:	PCSK1	P29120	S516	FEATIEYSRRGDLHV	77 / 9 AA	84
Phosphosite 2:	FURIN	P09958	Y495	QARLTLSYNRRGDLA	87 / 8 AA	87
Phosphosite 3:	PCSK4	Q6UW60	S499	VQAQLTLSYSRRGDL	100 / 7 AA	83
Phosphosite 4:	PCSK1	P29120	Y515	QFEATIEYSRRGDLH	75 / 8 AA	84
Phosphosite 5:	FURIN	P09958	S494	AQARLTLSYNRRGDL	85 / 7 AA	87
Phosphosite 6:	RPAP3	Q9H6T3	S205	RSYTKAYSRRGAARF	66 / 9 AA	76
Phosphosite 7:	MANBA	O00462	S24	TAAELSYSLRGNWSI	75 / 8 AA	101
Phosphosite 8:	RPAP3	Q9H6T3	Y204	NRSYTKAYSRRGAAR	75 / 8 AA	76
Phosphosite 9:	LTK	P29376	Y677	DIYRASYYRRGDRAL	85 / 7 AA	92
Phosphosite 10:	ASTL	Q6HA08	S244	HYGRLAFSRRGLPTI	71 / 7 AA	46
Phosphosite 11:	HOXC12	P31275	Y44	PGLPSLSYPRRDNVC	62 / 8 AA	30
Phosphosite 12:	C6orf217	P0C7V0	S77	TSAPMMYSRRGVRRT	71 / 7 AA	29
Phosphosite 13:	C6orf217	P0C7V0	Y76	ATSAPMMYSRRGVRR	71 / 7 AA	29
Phosphosite 14:	MATR3	P43243	Y158	EEGPTLSYGRDGRSA	75 / 8 AA	95
Phosphosite 15:	HOXC12	P31275	S43	LPGLPSLSYPRRDNV	71 / 7 AA	30
Phosphosite 16:	SLC9A2	Q9UBY0	Y619	IRQRTLSYNRHSLTA	62 / 8 AA	92
Phosphosite 17:	SLC9A2	Q9UBY0	S618	QIRQRTLSYNRHSLT	71 / 7 AA	92
Phosphosite 18:	ZNF540	Q8NDQ6	S561	KECGKSFSRRGQFTE	71 / 7 AA	77
Phosphosite 19:	QSER1	Q2KHR3	S308	IPPVQTLSYSKPLHN	71 / 7 AA	190
Phosphosite 20:	IKZF5	Q9H5V7	S192	KTSNLGYSRRALINL	62 / 8 AA	47