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amino acid residues molecular masses*
Residue	3-letter	1-letter	Formula	Average mass	Monoisotopic mass
Glycine	Gly	G	C2H3NO	57.051	57.02146372
Alanine	Ala	A	C3H5NO	71.078	71.03711378
Serine	Ser	S	C3H5NO2	87.077	87.03202840
Proline	Pro	P	C5H7NO	97.115	97.05276385
Valine	Val	V	C5H9NO	99.131	99.06841391
Threonine	Thr	T	C4H7NO2	101.104	101.04767847
Cysteine	Cys	C	C3H5NOS	103.143	103.00918478
Isoleucine	Ile	I	C6H11NO	113.158	113.08406398
Leucine	Leu	L	C6H11NO	113.158	113.08406398
Asparagine	Asn	N	C4H6N2O2	114.103	114.04292744
Aspartic acid	Asp	D	C4H5NO3	115.087	115.02694302
Glutamine	Gln	Q	C5H8N2O2	128.129	128.05857751
Lysine	Lys	K	C6H12N2O	128.172	128.09496301
Glutamic acid	Glu	E	C5H7NO3	129.114	129.04259309
Methionine	Met	M	C5H9NOS	131.196	131.04048491
Histidine	His	H	C6H7N3O	137.139	137.05891186
Phenylalanine	Phe	F	C9H9NO	147.174	147.06841391
Arginine	Arg	R	C6H12N4O	156.186	156.10111102
Tyrosine	Tyr	Y	C9H9NO2	163.173	163.06332853
Tryptophan	Trp	W	C11H10N2O	186.210	186.07931295
Appendix
hydronium cation			H3O+	19.0227	19.01784115084
Hydrogen		H	H	1.00794	1.00782503223
Carbon		C	C	12.0107	12
Nitrogen		N	N	14.0067	14.0030740044
Oxgen		O	O	15.9994	15.99491461957
Sulfur		S	S	32.065	31.9720711744
proton		p	H+		1.007276466812
electron		e			0.00054857990946
*http://www.riken.jp/BiomolChar/files/Isotopicmasses.htm