Fig. 9. Flare activity is not wholly dependent on actin assembly. GFP-Cnn embryos were injected with the actin destabilizing drug cytochalasin-D. In the absence of the actin cytoskeleton, the nuclear and centrosome divisions were not inhibited. The drug apparently does not affect flare activity. The centrosomes flared under these conditions and appeared to transfer flare particles more readily from one centrosome to another (see arrowheads in 132 and 249). The arrows in the figures indicate the direction of movement of the flare particles located closest to the tips of the arrows. movies available at jcs.biologists.org/supplemental.