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. 2018 Oct 22;4:29. doi: 10.1038/s41378-018-0028-z

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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 images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 5 — a Schematic diagram of the photolithographic fabrication process and liquid delivery system of the hollow MTM with an SEM image of a three triangular pillar array design. The scale bar indicates 200 μm. b Illustration of the solution delivery through the microfluidic channel-based pores on the through-hole membrane into the cavity of the MTM and the optical microscopy image of the system. Sequential photographs of the rhodamine B solution flow through the pore of the through-hole PEG-DA membrane by time (steps i–iv). The scale bar indicates 2000 μm