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. 2016 Sep 15;6:33462. doi: 10.1038/srep33462

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Copyright © 2016, The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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Confocal images of (a) helical tube, (b) parallel helical tube, (c,d) different knots. Cells were labeled with Cell-tracker Green/Red. 32G needles were used in (a,b), and 30G (inner diameter 0.15 mM) needles were used in (c,d). Scale bar 200 μm.