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. 2018 Jun 19;16:53. doi: 10.1186/s12951-018-0379-5

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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. 2 — a Fluorescence intensity image of HT29-MTX cells in the presence of food-grade E171 particles recorded 18 µm above the substratum 1 h after particle injection. b Evolution of fluorescence intensity over time inside two distinct areas identified by white rectangles in the previous image. c Fluorescence intensity image sequence over time in area 1 from injection of food-grade E171 to 1 h after. λ_exc = 364 nm. λ_em = 400–700 nm