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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