for amino acid composition see Table 13 Merck AG, Darmstadt, GFR suspension in methanol; 10 pg standard 1 X 105

remarks - This spectrum shows the extremely high H2S+" peak at m/z 34 so characteristic for the abundant Cys residues in keratin. Although this peak is off-scale its actual height can be judged from the isotope peak at m/z 36 (5% 34s abundance). The high Cys content also appears to be responsible for the marked peak at m/z 76 thought to represent CS2+".

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