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:	spermidine synthase
Human P-Site:	S256
P-Site Sequence:	MLCSKNPSTNFQEPV
UniProt:	P19623
Intern. Prot. ID:	IPI00292020

Protein Phosphosite Match	Human Protein Short Name	Human UniProt. ID	Phosphosite Number	Sequence	% Identity / # AA	Target Size kDa
Phosphosite 0:	spermidine synthase	P19623	S256	MLCSKNPSTNFQEPV	100 / 9 AA	34
Phosphosite 1:	spermidine synthase	P19623	T257	LCSKNPSTNFQEPVQ	100 / 8 AA	34
Phosphosite 2:	ZBTB41	Q5SVQ8	S122	ACLSKNPSTDVVTLD	85 / 7 AA	105
Phosphosite 3:	LIN54	Q6MZP7	S381	QPVSQNPSTNTQPLQ	77 / 9 AA	79
Phosphosite 4:	MRE11A	P49959	S225	QNRSKHGSTNFIPEQ	75 / 8 AA	81
Phosphosite 5:	CFLAR	O15519	S198	QKSLKDPSNNFRLHN	62 / 8 AA	55
Phosphosite 6:	SOX4	Q06945	S412	LLDLNPSSNFESMSL	71 / 7 AA	47
Phosphosite 7:	SOX4	Q06945	S411	DLLDLNPSSNFESMS	71 / 7 AA	47
Phosphosite 8:	E2F4	Q16254	S334	SGPNPSTSFEPIKAD	71 / 7 AA	44
Phosphosite 9:	E2F4	Q16254	S332	SSSGPNPSTSFEPIK	71 / 7 AA	44
Phosphosite 10:	GNPTAB	Q3T906	T178	AKPKNPSTNVSVVVF	100 / 6 AA	144
Phosphosite 11:	NMT2	O60551	S85	QQPSKNPSVPMQKLQ	66 / 9 AA	57
Phosphosite 12:	RAD54L2	Q9Y4B4	S1053	SASSTNPSMNFPINY	66 / 9 AA	163
Phosphosite 13:	PSME4	Q14997	S1114	LQQSKNPSINQILLS	85 / 7 AA	211
Phosphosite 14:	SQSTM1	Q13501	S233	SGPSEDPSVNFLKNV	62 / 8 AA	48
Phosphosite 15:	SULT1E1	P49888	T237	EMKNNPSTNYTTLPD	71 / 7 AA	35
Phosphosite 16:	SLC30A9	Q6PML9	S389	VMESRDPSTNVILLE	71 / 7 AA	64
Phosphosite 17:	TFAP2B	Q92481	S62	PPLSHTPSSDFQPPY	55 / 9 AA	50
Phosphosite 18:	TSC22D2	O75157	S656	GDEDRNPSTAFYQAF	71 / 7 AA	79
Phosphosite 19:	ZNF518B	Q9C0D4	T251	KASNPRTTFQNKWSD	71 / 7 AA	120
Phosphosite 20:	ZNF518B	Q9C0D4	T250	LKASNPRTTFQNKWS	71 / 7 AA	120