High resolution image of an isolated and longitudinally fractured cilium exposing the middle of the cilium. The spokes extend from the doublets toward the two singlet microtubules. These spokes are spaced unevenly so they appear to be arranged into triplets. The fracture plane, while in general is longitudinal, exposes the singlets and outer doublets at different levels so various periodicities appear along these microtubules. The cilium may also be slightly twisted along its length. TEM taken on 2/15/88 by C. Schroeder with Zeiss 10A operating at 80kV. Neg. 31,500X. The raw film was scanned with an Epson Perfection V750 Pro. This image is best used for quantitative analysis.