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. 2020 Apr 25;18:64. doi: 10.1186/s12951-020-00621-6

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© The Author(s) 2020

Open AccessThis 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/. 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 in a credit line to the data.

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Fig. 7 — Time-lapse imaging of growth cone motility and axon elongation of DRG neurons in the a treatment group (FMSPs+, M+), b FMSP control group (FMSPs+, M−), c magnetic field control group (FMSPs−, M+) and d blank control group (FMSPs−, M−). e The average elongation rate of the axons in the treatment group compared to the control groups. A total of 173, 145, 154 and 138 axons were collected and measured in the four experimental groups, namely, the treatment group, FMSP control group, magnetic field control group and blank control group, respectively. The yellow arrows represent the direction of the magnetic field. The white circles highlight the growth cones. The images in a–d were captured at intervals of 50 min. *P < 0.05