Proceedings of the National Academy of Sciences USA 111: 7325-7330 Histone variant H3.3 is an essential maternal factor for oocyte reprogramming Duancheng Wen, Laura A. Banaszynski, Ying Liu, Fuqiang Geng, Kyung-Min Noh, Jenny Xiang, Olivier Elemento, Zev Rosenwaks, C. David Allis and Shahin Rafii