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Diagrams showing the polar orientation of Spindle MTs, as assessed by the tubulin-containing hooks. Euteneuer and McIntosh 1981, 1982 [56,57]. 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/.
