Carbohydrate Database All Carbohydrate Entries HIV Pituitary Hormone Plasma/Serum Proteins Peptide Sequence   or     Peptide Mass Cysteine Modification none carboxymethyl carbamidomethyl Variable Modification none carbamylation formylation Pyro_Glu(Q)) or Pyro-Cmc(C) Oxidation of Methionine Charge State +1 +2 +3 +4 +5 +6 +7 -1 -2 -3 -4 -5 -6 -7 Charge Carrier H Na Mass Tolerance  ± ppm PeakList