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. Author manuscript; available in PMC: 2015 Dec 1.
Published in final edited form as: J Am Soc Mass Spectrom. 2014 Dec;25(12):2000–2008. doi: 10.1007/s13361-014-0834-y

Figure 1.

Figure 1

Structures of the native (N) and A states of ubiquitin. (N) shows the native structure characterized by X-ray crystallography in ref. 17. (A) illustrates the structural model of the A state constructed based on the structure proposed in ref. 18.