Fig. 7. Kinetics of in vitro tubulin-polymerization. Length distribution of the forming microtubules plotted against the time allowed for tubulin polymerization. White and grey arrows and bars correspond to egg extracts of females with one wild-type Tub67C gene (+/-, control) and egg extracts of females not carrying functional Tub67C genes (kavar⁰/-). The wide arrows represent preparations in which only nucleation seeds appeared. The five horizontal lines in the bars correspond to 10th, 25th, 50th, 75th and 90th percentiles, respectively (as shown on the right). For details of tubulin polymerization see supplementary material Fig. S1. White and gray diamonds represent average microtubule lengths for control and null-mutant, respectively. Curves (double line, control; single line, null) were fitted to these points.