Cytoskeleton organization during the cell cycle. The cell growth cycle of fission yeast is represented, with sites of active growth labeled by the red lines and arrows. The microtubules (green), actin cytoskeleton (dark red), and sterol-rich membrane domains (light blue) are depicted at representative cell cycle stages. Individual images of these structures are shown at the bottom, where the actin cytoskeleton is stained with phalloidin, microtubules are shown with GFP-atb2, and sterol-rich domains are labeled with filipin.