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. 2019 May 15;41(1):3–9. doi: 10.1007/s10974-019-09515-z

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© The Author(s) 2019

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.

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Fig. 2 — Contraction of actomyosin threads. Myosin B threads treated with water-extract of muscle (left) and in the absence of treatment (right) (Szent-Györgyi 1942a, b, c)