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Amino acid residue and fragment ion mass values Residue Alanine Cysteine Asp. acid Glu. acid Phenylalanine Glycine Histidine Isoleucine Lysine Leucine Methionine Asparagine Proline Glutamine Arginine Serine Threonine Valine Tryptophan Tyrosine 3-letter Ala Cys Asp Glu Phe Gly His Ile Lys Leu Met Asn Pro Gln Arg Ser Thr Val Trp Tyr 1-letter A C D E F G H I K L M N P Q R S T V W Y Mass 71.0371 102.0014 115.0269 129.0426 147.0684 57.0215 137.0589 113.0841 128.095 113.0841 131.0405 114.0429 97.0528 128.0586 156.1011 87.032 101.0477 99.0684 186.0793 163.0633 b1 ion 72.0444 103.0086 116.0342 130.0499 148.0757 58.0287 138.0662 114.0913 129.1022 114.0913 132.0478 115.0502 98.06 129.0659 157.1084 88.0393 102.055 100.0757 187.0866 164.0706 y1 ion 90.055 121.0192 134.0448 148.0604 166.0863 76.0393 156.0768 132.1019 147.1128 132.1019 150.0583 133.0608 116.0706 147.0764 175.119 106.0499 120.0655 118.0863 205.0972 182.0812 bn-1 ion 54.0338 84.9981 98.0237 112.0393 130.0651 40.0182 120.0556 96.0808 111.0917 96.0808 114.0372 97.0396 80.0495 111.0553 139.0978 70.0287 84.0444 82.0651 169.076 146.06