Fig. 1. Motility of individual pigment granules in a granule-depleted melanophore fragment with fluorescently labeled microtubules (see text and Sequence 1). A granule (arrowheads) moved along an irregular track which did not correspond to a microtubule; numbers in the lower left corner of each frame indicate time in s; arrows in the last frame show distance covered by the granule within each 97s time interval; Bar, 5 µm.