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. 2010 Sep 27;30(Pt 6):433–443. doi: 10.1042/BSR20090167

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© 2010 The Author(s) The author(s) has paid for this article to be freely available under the terms of the Creative Commons Attribution Non-Commercial Licence (http://creativecommons.org/licenses/by-nc/2.5/) which permits unrestricted non-commercial use, distribution and reproduction in any medium, provided the original work is properly cited.

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(a) ESI–MS spectrum recorded in the positive-ion mode, (b) CID fragmentation spectrum (precursor ion m/z 491.7) and (c) ECD fragmentation spectrum (precursor ion m/z 491.7). K* represents possible phosphorylation on the lysine ε-amino group. The fragmentation pattern is shown in each spectrum. c_n- and z^•_n-fragmentation ions with the index P present the phosphorylated fragment of the peptide.