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Anterior suture region of Paramecium tetraurelia stained using the revised Fernández-Galiano protocol. Cortical units containing basal bodies and parasomal sacs (bb), and kinetodesmal fibers (kf) are clearly visible. In some regions, outlines of the alveolar membranes (av) that define the edges of cortical units also are stained. Planapochromatic objective. 100 × oil immersion. Image processed and labeled using ImageJ software.
