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. 2016 Dec 21;5(4):55. doi: 10.3390/biology5040055

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© 2016 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).

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A portion of a sea urchin mitotic spindle (SP) imaged in an electron microscope, showing the MTs (arrows) that make up the spindle fibers that had been seen by light microscopy. The curved dashed line marks the polar end of the spindle and the beginning of a specialized region that surrounds the spindle pole in these cells. (Dark rods are contamination.) Harris, 1965 [30]. This image is displayed under the terms of a Creative Commons License (Attribution-Noncommercial-Share Alike 3.0 Unported license, as described at http://creativecommons.org/licenses/by-nc-sa/3.0/.