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. 2017 Oct 11;13:82. doi: 10.1186/s13007-017-0234-y

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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. 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. 2 — Image of the agarose gel of the PCR products (gDNA) ran by electrophoresis obtained from genomic DNA (gDNA) extracted from 17 tissue samples of Opuntia Mill., using the improved extraction method. a nDNA internal transcribed spacer (ITS), b cpDNA RuBisCO gene (rbcL), c mtDNA cytochrome oxidase subunit 3 (cox3) (Promega™ 1 kb DNA Ladder Molecular Weight Marker)