Cover picture: Plots of pseudocolored light intensity, increasing from red to blue, which were detected along Chlamydomonas flagella by differential interference contrast video microscopy. Vertical and horizontal axes represent distance from basal bodies and time of observation, respectively. Moving particles undergoing anterograde or retrograde intraflagellar transport are visualized as streaks with a rightward or leftward slope, respectively. (Top) pf15 flagellum. (Bottom) fla17-1pf15 flagellum. See related article in this issue by Piperno et al., 1591–1601.