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Fig. 2. Ultrastructure of the flagella connector viewed by thin-section EM. (A) Cross section though the flagella connector (asterisk). The new flagellum (nf) is always observed to the left of the old flagellum (of) when viewed from the posterior end of the cell. The flagella connector is composed of three discrete connection zones between two opposing flagellar membranes. These membranes display a more electron dense, linear profile, which is exemplified in (B), in which the section is cut through the extreme distal tip of the new flagellum. (C) A glance section through the flagella pocket reveals the presence of the flagella connector just distal to the transition zone (tz) at the end of the basal body, revealing its early appearance during flagellum elongation [axoneme (ax) paraflagella rod (pfr)]. Scale bars, 200 nm.





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