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Identification of phosphorylated Ser198 of human butyrylcholinesterase. The MALDI MS/MS spectrum of parent ion 876.3 Da, in positive mode, shows major y- and b-ions of peptide FGEpSAGAAS. The fragment ion masses support phosphorylation of serine 198, the active site serine. The symbol Δ represents fragments which have undergone loss of phosphate and a molecule of water, thus converting phosphoserine into dehydroalanine.
