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 Abstract Publication: PLoS ONE Pub Date: August 2016 DOI: 10.1371/journal.pone.0160445 Bibcode: 2016PLoSO..1160445Y