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Protein Protocols Protein Protocols

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Mass Spectrometry of <strong>Protein</strong> Phosphorylation 615<br />

Fig. 2. Mass spectrum of the endoproteinase LysC peptides K 2 and K 26 from the head and<br />

the central domain of interphase (A,C) and mitotic (B,D) lamin. Because of the large size, each<br />

peptide produces a complex spectrum of multiply charged ions. Therefore, only the triply<br />

and quadruply charged peptides (labeled with 3 + and 4 + ) in the mass range between 1000 and<br />

2000 Da are shown. The phosphorylated peptides are labeled with an asterisk. Because it was<br />

not possible to separate all of the lamin peptides into single components during the LC/MS run,<br />

the spectra in (A) and (B) contain signals from coeluting peaks other than K 2. (From ref. 17).

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