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. 2017 Sep 20;17:158. doi: 10.1186/s12870-017-1101-8

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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 — Scanning electron micrographs of the central endosperm region of double null mutants of Pina and Pinb genes. a Freeze-fractured grain of wild type accession (Chinese Spring, soft type control). b Durum wheat accession (Neixiang 4184; Pin null: both genes deleted, very hard control). c Xinong 8925–13 (Pina-D1x/Pinb-D1ah). d Yunfengzao 21 (Pina-D1x/Pinb-D1ah)