Movie 4.

Time-lapse imaging of oocyte meiosis in an oops-1(tn1898) null mutant showing an example of polyspermy. Note two centrosomes duplicate to form a tetrapolar spindle with three pronuclei, which are then joined by a fourth nucleus of meiotic products. Chromatin is labelled in red, and microtubules are labelled in green. Time-lapse taken at 30 sec intervals for 26 min (53 frames).