Structure of basal bodies revealed by electron tomography. (A) Room temperature tomography visualized microtubule networks around basal bodies. From  with permission from Wiley. (B) Reconstruction from cryo-electron tomography indicates the hook structure on the microtubule triplet (top left), stacked cartwheels (bottom left and right), and branched spokes (right). From . Reprinted with permission from AAAS.
BB basal body. proBB pro-basal body.