Time-course of oocyte activation, pronucleus formation and cleavage in human oocytes fertilized by intracytoplasmic sperm injection.( u5 t. i& s9 w& ]3 B. X0 a+ E: ~ http://europepmc.org/abstract/MED/7836530/reload=0;jsessionid=y00aoVbMokYnHqkVQxji.16