Fertilization in Lytechinus pictus (0.8 Mb). Courtesy of the Exporatorium.Fertilization envelope elevation in Lytechinus pictus . Images from a movie courtesy of the...Normal egg with one cleavage furrow (about 90 min after insemination) whereas on the left, a...Normal egg with one cleavage furrow (about 90 min after insemination) whereas on the left, a...Fertilization in Paracentrotus lividus (0.4 Mb). Courtesy of Christian Gache and Thierry Lepage,...Once a sperm contacts the viltelline membrane, it binds to a receptor protein that triggers the...Windows: Right click on animation and choose save to file Macintosh: Hold click on animation and...from the Amphibian Embryology TutorialJust_1.GIF 09-Apr-1998 08:40 7.8Kfrom the Amphibian Embryology TutorialFigure 12.3 When a sperm cell enters a secondary oocyte, the tail is shed leaving a head or sperm...Pellucid zone Perivitelline space Cortical vesicle OolemmaGamete interactions. Blocking Polyspermy. Polyploidy can be bad and good.