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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 2. — The centriole of Tribolium spermatids has doublet microtubules. (a) High-pressure freezing (HPF), freeze substitution (FS) and serial section TEM analysis of Tribolium golfclub/S-shape spermatid showing the transition from a centriole lacking central microtubules to an axoneme with central microtubules. Abbreviations: Ax, axoneme; C, centriole; M, mitochondria; N, nucleus. (b) Magnification of axoneme and centriole cross-sections. Yellow arrowheads: the microtubules in the doublet microtubules; green line: accessory microtubule. (c) Model of the axoneme-attached centriole. The centriole is made of doublet microtubules labelled A and B in ninefold symmetry, which is different than Drosophila's sperm's axoneme-attached centriole's triplets, labelled A, B and C.