Four joined serial, double-tilt tomograms of the basal area of a monkey rod OS. The movie includes approximately two-thirds of the OS diameter, from the periphery to beyond the central area where the axoneme is visible. The ROI appears in the center. Every second z-slice was exported from 3dmod as a tiff file and then converted into a movie using Fiji. Images of individual z-slices are shown in Fig. 2 A–C and Fig. 3 A–C.