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Fig. 2. Accumulation of chloroplasts in the cell apex of the coenocytic green alga Dichotomosiphon. (A-D) Dim blue light induced the accumulation of chloroplasts in the apical region of a cylindrical cell of Dichotomosiphon over a period of 0-90 min. (E) Microtubules (MT; green) and (F) actin filaments (AF; red) in the apical region filled with chloroplasts (blue) were visualized using fluorescence-labelled probes. Scale bar: 20 µm.