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. 2018 May 7;30(1):7–15. doi: 10.1007/s13361-018-1910-5

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© The Author(s) 2018

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Tandem mass spectra and breakdown curves of mass-selected GroES and gp31 heptamers. Tandem MS of (a) GroES¹⁷⁺, HCD voltage 40 V (left) and HCD voltage 75 V (right), and (c) gp31¹⁹⁺, HCD voltage 20 V (left) and HCD voltage 25 V (right); × 5 and × 10 are magnification factors for indicated region. (b) Breakdown curves of GroES¹⁷⁺ and gp31¹⁹⁺ against range of applied collision voltages. (d) Average charge of monomers released from GroES¹⁷⁺ and gp31¹⁹⁺ as percentage of precursor charge plotted against the applied HCD voltages