Neonatal human dermal fibroblasts were grown on coverslips, fixed with 4% formaldehyde, and permeabilized with 0.2% Triton X-100. Tubulin was detected with anti–tubulin-a (bovine) antibody (mouse IgG1, monoclonal 236-10501) and visualized using Alexa Fluor® 594 goat anti–mouse IgG. Actin filaments were labeled with Alexa Fluor® 488 phalloidin, and nuclei were stained with Hoechst 33342. Coverslips were mounted on slides using ProLong® Gold antifade reagent. The multiple-exposure image was acquired on a Zeiss LSM 710 confocal microscope at 63x and 16-slice Z-stack maximum intensity projection. Image contributed by Kevin Chambers, Life Technologies.