Movies of Drosophila embryos expressing GFP-fusions to Centrosomin, Tubulin, Histone, and injected with a variety of dyes and drugs and examined in wild-type and cnn mutants.

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Movie1: GFP-Cnn expression in the early Drosophila embryo. Shown is nearly the entire embryo through two complete cleavage cycles.

Movie2: GFP-Cnn embryos injected with rhodamine-labeled tubulin. The dynamics and centrosomin and the microtubules can be followed simultaneously. Particles, or "flares", are seen to emerge from the centrosomes in this movie.

Movie3: Close-up view of GFP-Cnn centrosomes to show the highly dynamic nature of the flares, and how the flaring activity changes with the cleavage cycle (highest at interphase and lowest at metaphase).

Movie4: Flare movement is dependent upon microtubles. Injection of GFP-Cnn embryos with colchicine, a microtubule-destabilizing drug, arrests flare particle movement.

Movies5: GFP-Tubulin (Movies 5A and 5B) and GFP-Cnn (Movies 5C and 5D) embryos treated with the microtubule-stabilizing drug paclitaxel (Taxol) (Movies 5B and 5D) and control treatment (Movies 5A and 5C). Stabilizing microtubules reduced flare activity drastically, indicating that flare movement depends more upon inherent microtubule dynamics rather than being transported by microtubule-based motor proteins.

Movie6: GFP-Cnn embryos injected with rhodamine-labeled actin. Flare particles are seen to be restricted in their movement by the pseudocleavage furrow. The flare particles transit right up to the edge of the actin cage.

Movie7: GFP-Cnn embryos injected with cytochalasin-D to inhibit actin microfilament polymerization. Actin is not required for flare movement, and flares more readily jump from one centrosome to another.