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. 2018 Dec 7;18:338. doi: 10.1186/s12870-018-1570-4

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© The Author(s). 2018

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. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 6 — Extracted ion chromatograms showing the product of NpNBS enzyme assays. The tested substrates used were 3,4-dihydroxybenzaldehyde (300 μM) and tyramine (10 μM), the extracted ion chromatogram corresponds to standard NB or assays conducted with the non-induced protein fraction, the heat-denatured recombinant NpNBS enzyme; and the complete assay performed with recombinant NpNBS at pH 4 and pH 7. Parent ion mass-to-charge (m/z) of 260 for norbelladine and 258 for norcraugsodine were subjected to collision-induced dissociation analysis for identification and quantitation (Additional file 3)