Figure 3.

Treatment of melanosomes with metaphase-, but not interphase-arrested frog egg extracts inhibits actin-based motility along Nitella actin filaments in vitro. The histogram shows the numbers of motile (black bar) and immotile (white bar) melanosomes treated with interphase extracts (I), metaphase extracts (M), or untreated control organelles (MS). Treatment with mitotic extracts inhibited motility ∼10-fold, compared with the other two treatments. The results of two independent experiments are shown.