Fig. 1. Rac1 activates Basket to induce Rho-kinase activity (A-D) Hemocyte actin cytoskeleton was visualized using Alexa Fluor 546-phalloidin. (A) Hml-Gal4 controls, (B) UAS-Rac1F37A;Hml-Gal4, (C) UAS-Rac1F37A;UAS-Rokcatkg/Hml-Gal4,(D) UAS-Rac1F37A;Hml-Gal4;UAS-BskIR. (E) Stress fiber phenotypes. The hemocytes from five different larvae were counted to determine the percentage of cells having either thick or thin stress fibers [(number of hemocytes with phenotype/total number of hemocytes) x 100]. An asterisk indicates a significant difference (Student's t-test, P<0.01) compared with the parental UAS and Hml-Gal4 strains.