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. 2017 Jun 28;8:15974. doi: 10.1038/ncomms15974

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Copyright © 2017, The Author(s)

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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(a) Rotational speeds of 6 micromotors driven by light powered bacteria. A feedback control loop is turned on at t=0 and adjusts light levels on each rotor based on its current speed. The feedback loop operates with a 10 s time interval shown as vertical dashed lines. (b) The s.d. of the speed in the 6 rotor sample quickly drops when we switch on the feedback control (t=0). (c) Solid lines represent the light levels over each micromotor (colour coding same as in a).