Zinc sparks induce physiochemical changes in the egg zona pellucida that prevent polyspermy. Related Articles Zinc sparks induce physiochemical changes in the egg zona pellucida that prevent polyspermy. Integr Biol (Camb). 2017 Jan 19;: Authors: Que EL, Duncan FE, Bayer AR, Philips SJ, Roth EW, Bleher R, Gleber SC, Vogt S, Woodruff TK, O'Halloran TVOriginal Article