Fig. 3. Movement of chromosomes following meiosis I spindle assembly. Time-lapse images of the same oocyte as in Fig. 1, shown at 5 minute intervals for 45 minutes following the appearance of a polar spindle (see Movie 2 in supplementary material). The dark regions, interpreted to be the meiotic chromosomes, continue moving in the spindle. Time, minutes:seconds. Bar, 5 µm.