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. 2017 Mar 15;7(3):160334. doi: 10.1098/rsob.160334

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© 2017 The Authors.

Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 3. — The 2nd centriole of Tribolium spermatids lack microtubules. (a,b) Representative HPF-FS TEM semi cross-section (a) and semi-longitudinal (b) analysis of Tribolium golfclub spermatids. Images on the right are insets of images on the left, signified by the red box. Brackets indicate the axis representing the PCL diameter. Arrows indicate the location of the barely detectable electron-dense central core. (c) A model of the second centriolar structure in spermatids. The structure of the PCL (P) is slightly different than Drosophila's PCL. (d) Representative TEM sections of the second centriolar structure in Tribolium spermatozoa. Abbreviations: Ax, axoneme; M, mitochondria; N, nucleus. Scale bars, 1 µm.