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A CID mass spectrum of the diethoxyphosphate-labeled, bovine tubulin beta, tryptic peptide K*Y*VPR. The values enclosed in the boxes are the masses of the characteristic fragments for diethoxyphosphate-labeled lysine and diethoxyphosphate-labeled tyrosine. The parent ion is marked by [M+2H]+2. Lysine 58 and tyrosine 59 are labeled by chlorpyrifos oxon.
