Micrtubule Structure
Microtubules are hollow, with walls consisting of 13 polymerized dimers of α-tubulin and β-tubulin (right image). The left image shows the molecular structure of the tube.
Source
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"OpenStax College, The Cytoskeleton. October 16, 2013."
http://cnx.org/content/m44412/latest/Figure_04_05_04ab.jpg
OpenStax CNX
CC BY 3.0.
