Peptide Mass Spec Data

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Residue masses of natural and modified amino acids (alphabetic)

Amino acid Letter code Residue Mass (Da)
Alanine A 71.04
Arginine R 156.10
Asparagine N 114.04
Aspartate D 115.03
Cystine C 103.01
Phenylalanine F 147.07
Glutamine Q 128.06
Glutamate E 129.04
Glycine G 57.02
Histidine H 137.06
Isoleucine I 113.08
Leucine L 113.08
Lysine K 128.09
Methionine M 131.04
Proline P 97.05
Serine S 87.03
Threonine T 101.05
Tryptophan W 186.08
Tyrosine Y 163.06
Valine V 99.07
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