Colour-enhanced Transmission Electron Micrograph (TEM) showing a pair of centrioles. One centriole in transverse section (above), the other in longitudinal section; each centriole has a cylindrical system of 9 triplet microtubules (as do the basal bodies of all eukaryotic cilia and flagella); centrioles typically lie perpendicular to one another; in animal cells, the centrioles act as microtubule organizing centres and control spindle construction from microtubules during cell division. Magnification: 75,000X at 2.25 film size.
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