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:	Rb
Human P-Site:	S503
P-Site Sequence:	ATYSRSTSQNLDSGT
UniProt:	P06400
Intern. Prot. ID:	IPI00302829

Protein Phosphosite Match	Human Protein Short Name	Human UniProt. ID	Phosphosite Number	Sequence	% Identity / # AA	Target Size kDa
Phosphosite 0:	Rb	P06400	S503	ATYSRSTSQNLDSGT	100 / 9 AA	106
Phosphosite 1:	Rb	P06400	T502	MATYSRSTSQNLDSG	100 / 8 AA	106
Phosphosite 2:	C2orf67	A0AUZ9	S519	NGIYRSASENLDELS	75 / 8 AA	112
Phosphosite 3:	PLAT	P00750	S478	YPSSRCTSQHLLNRT	75 / 8 AA	63
Phosphosite 4:	PLAT	P00750	T477	LYPSSRCTSQHLLNR	75 / 8 AA	63
Phosphosite 5:	USP38	Q8NB14	S607	CLNCRSTSQKVEAFT	55 / 9 AA	117
Phosphosite 6:	CCNG2	Q16589	T276	VWIVSRRTAQNLHNS	75 / 8 AA	39
Phosphosite 7:	RNF212	Q495C1	S81	KKYSRETSQILEFQE	66 / 9 AA	33
Phosphosite 8:	SLC45A4	Q5BKX6	S348	PATPRSTSQELAKTK	75 / 8 AA	84
Phosphosite 9:	SNCAIP	Q9Y6H5	S809	PSSKRRTSQNLKLRV	75 / 8 AA	100
Phosphosite 10:	PSKH1	P11801	S372	KNLHRSISQNLLKRA	85 / 7 AA	48
Phosphosite 11:	SLC45A4	Q5BKX6	T347	YPATPRSTSQELAKT	75 / 8 AA	84
Phosphosite 12:	SNCAIP	Q9Y6H5	T808	SPSSKRRTSQNLKLR	85 / 7 AA	100
Phosphosite 13:	MYCBP2	O75592	S89	KVKTRSKSENLENTV	55 / 9 AA	510
Phosphosite 14:	WHRN	Q9P202	T572	SVDDVRSTSQGLSSF	85 / 7 AA	97
Phosphosite 15:	WHRN	Q9P202	S573	VDDVRSTSQGLSSFK	85 / 7 AA	97
Phosphosite 16:	ATRX	P46100	S2379	LALSRQASQELDVKR	66 / 9 AA	283
Phosphosite 17:	KIAA1414	Q9P2D3	S1564	GLQKRSTSVNLNQAS	75 / 8 AA	224
Phosphosite 18:	CABLES1	Q8TDN4	T256	PIAFSRPTSQNYCSL	85 / 7 AA	68
Phosphosite 19:	CABLES1	Q8TDN4	S257	IAFSRPTSQNYCSLE	75 / 8 AA	68
Phosphosite 20:	CRAMP1L	Q96RY5	S140	FGGSRSSSRNLGSSG	66 / 9 AA	135