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. 2018 Sep 10;18:113. doi: 10.1186/s12866-018-1237-1

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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. 1 — AB-PAS staining inverted microscopy micrographs (different parts of intestinal samples arbitrarily chosen as examples, 1-6: 100×; 7-12: 400×). 1, 2, 3, 7, 8 and 9 is the samples from paddy fields, and 4, 5, 6, 10, 11 and 12 is the samples from ponds. 1, 4, 7, 10: foregut; 2, 5, 8, 11: midgut; 3, 6, 9, 12: hindgut. L represent the acid mucous cells, M represent the partial acid mucous cells