Fig. 6. Control cells (A,D) and cells incubated with 75 nmol l^–1 palytoxin (B) or 75 nmol l^–1 ostreocin-D (E) for 4 h. Confocal microscopy shows that both toxins modify actin filaments, but there was no change in shape of the intestinal cells. (C,F) Transmission images of cells exposed to the toxins.