A MOTILITY IN THE EUKARYOTIC FLAGELLUM UNRELATED TO FLAGELLAR BEATING

We report a motility in the flagella of the green alga Chlamydomonas t hat is unrelated to dynein-based flagellar beating. This motility, ref erred to as intraflagellar transport, was observed as the rapid bidire ctional movement of granule-like particles along the length of the fla gella. Intraflagellar transport could be experimentally separated from other, previously reported, nonbeat flagellar motilities. EM of flage lla showed groups of nonvesicular, lollipop-shaped structures position ed between the outer doublet microtubules and the flagellar membrane. Movement of these complexes along the length of the flagella may be re sponsible for intraflagellar transport.