A Novel Cysteine Knot Protein for Enhancing Sperm Motility That Might Facilitate the Evolution of Internal Fertilization in Amphibians. - Yokoe, Misato; Takayama-Watanabe, Eriko; Saito, Yoko; Kutsuzawa, Megumi; Fujita, Kosuke; Ochi, Haruki; Nakauchi, Yuni; Watanabe, Akihiko (PLoS ONE, 2016)