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Fig. 2. Cytokinesis in control cells proceeds by an exponential or logarithmic decrease in the cleavage furrow diameter. (A) Phase micrographs of a time-lapse series showing cytokinesis of a single primary crane fly (Nephrotoma suturalis) spermatocyte. Pictures were taken at (h:min:s): 15:46:45, 15:49:40, 15:51:47, 15:54:27, 15:58:10 and 16:01:24. Bar, 10 µm. (B) Graph of cleavage furrow diameter of control cell shown in A measured as a function of time. The dashed line represents the computer-generated exponential best-fit curve to the points starting from the second minute.