Microtubules are the structural component of flagella
This transmission electron micrograph of two flagella shows the 9 + 2 array of microtubules: nine microtubule doublets surround a single microtubule doublet.
Source
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"OpenStax College, The Cytoskeleton. October 16, 2013."
http://cnx.org/content/m44412/latest/Figure_04_05_05.jpg
OpenStax CNX
CC BY 3.0.
