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Fig. 5. Light-dependent changes in motility of chloroplasts in Vallisneria epidermal cells. The motility of individual chloroplasts was determined after digitization of images obtained by video microscopy of Vallisneria epidermal cells under dim red light in the presence (filled symbols) or absence (open symbols) of dichlorophenyl dimethylurea (DCMU), an inhibitor of photosynthetic electron transport. Modified from Dong et al. (1996).