Myosin-null cells cannot divide on a hydrophobic surface. (A) A myosin-null cell expressing NLS-GFP fails to form a furrow on such a surface. Times of the panels are 0, 190, 485, 745, and 1010 s. (B) A cell expressing GFP-myosin divides successfully on a hydrophobic surface. Times of the panels are 0, 90, 155, 220, and 350 s. Bar, 5 μm.