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It is interesting to remember that AGG2 and AGG3 both have paralogs. , 2005). A fourth paralog (155892) was not found in these studies and may not be a flagellar protein. Both the AGG2 and AGG3 paralogs are likely to have arisen by a recent duplication as the paralogs are tightly linked to each other. It is interesting to speculate that different pairs of paralogs may be found in the cis and trans flagella to help impart different responses to light signals. Tagged versions of the paralogs will be needed to pursue this hypothesis.

4. 5. c Fig. 1. (a) Electron micrograph of a Chlamydomonas cell preserved by cryofixation methods to illustrate the position of the pair of basal bodies (indicated by *) in the cell at the anterior end. ) (b) Diagram of basal body and transition zone structures. The distance from the base to the tip is approximately 450 nm. ) Ring of amorphous material. ) Triplet microtubules, also known as microtubule blades, with pinwheel. ) The A, B, and C tubules of one triplet microtubule are indicated. The central shaft is devoid of the pinwheel, but γ-tubulin has been localized to this region.

24 ROLE OF BASAL BODIES IN GENERATING ASYMMETRY a b 2 1 c 5 3 4 Fig. 3. The fiber systems attached to the Chlamydomonas basal body complex. (a) The mature basal bodies are shown in red, the transition zones in peach, and the probasal bodies in pink. The microtubular rootlets have four microtubules (orange) or two microtubules (yellow) and attach at specific triplet microtubules of the basal body. The distal (solid) and proximal (striped) striated fibers are shown in light blue (here, the latter are partially hidden by the former).