De La Vega-Beltran JL, S?nchez-C?rdenas C, Krapf D, Hernandez-Gonz?lez EO, Wertheimer E, Trevi?o CL, Visconti PE, Darszon A. Mouse sperm membrane potential hyperpolarization is necessary and sufficient to prepare sperm for the acrosome reaction. J Biol Chem. 2012 Dec 28; 287(53):44384-93.