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. 2017 Jul 27;49(10):1719–1731. doi: 10.1007/s00726-017-2470-x

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© The Author(s) 2017

Open AccessThis 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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Fig. 2 — ESI mass spectra of PalmYPFF ([M + H]⁺ 810.4.0, [M + Na]⁺ 832.2, [M + K]⁺ 848.1, [2 M + Na]⁺ 1640.9 and [M-H]⁻ 808.1, [M-H + HCl]⁻ 843.6, [M-H + CF₃COOH]⁻ 922.3)