1	SBG	O-[(S)-hydroxy(methyl)phosphoryl]-L-serine	1.000
2	2RX	O-thiophosphono-L-serine	0.833
3	SEP	Phosphoserine	0.833
4	SVV	O-[(S)-amino(hydroxy)phosphoryl]-L-serine	0.833
5	SVW	O-[(R)-amino(hydroxy)phosphoryl]-L-serine	0.833
6	D11	D-phosphothreonine	0.769
7	FGP	2-amino-3-hydroxy-3-phosphonooxy-propionic acid	0.769
8	OMH	O-[(S)-hydroxy(methoxy)phosphoryl]-L-serine	0.769
9	T8L	Thio-phosohothreonine	0.769
10	TPO	Phosphothreonine	0.769
11	YTH	O-phosphono-L-allothreonine	0.769
12	48X	3-(phosphonooxy)propanoic acid	0.750
13	PSE	O-phosphoethanolamine	0.750
14	MIR	Monoethylphosphorylserine	0.714
15	SEN	O-[N,N-dimethylphosphoramidate]-L-serine	0.714
16	SVX	O-[(R)-ethoxy(methyl)phosphoryl]-L-serine	0.714