ArticleTwo Egg-Derived Molecules in Sperm Motility Initiation and Fertilization in the Pacific Herring (Clupea pallasi)Yanagimachi, R.Sperm of the Pacific herring are immotile at spawning. Two egg-derived molecules are capable of initiating sperm motility. One is herring sperm activating protein(s) (HSAPs) and the other is sperm motility initiation factor (SMIF). These two motility . . .