An Ovol2-Zeb1 Mutual Inhibitory Circuit Governs Bidirectional and Multi-step Transition between Epithelial and Mesenchymal States. - Tian Hong; Kazuhide Watanabe; Catherine Ha Ta; Alvaro Villarreal-Ponce; Qing Nie; Xing Dai (PLoS Comput. Biol., 2015)