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. 2016 Dec 2;7:13652. doi: 10.1038/ncomms13652

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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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(a) Association between midpiece length and straight-line velocity of F₂ hybrid males (linear regression: n=233 males, n=10 sperm/male). For reference, midpiece length of each parental species is plotted as a dashed line. (b) Mean±s.e. sperm midpiece length of F₂ males that did (n=85) and did not (n=173) sire offspring (t-test). Note truncated y axis.