Two Supporting Factors Greatly Improve the Efficiency of Human iPSC Generation - Yang Zhao; Xiaolei Yin; Han Qin; Fangfang Zhu; Haisong Liu; Weifeng Yang; Qiang Zhang; Chengang Xiang; Pingping Hou; Zhihua Song; Yanxia Liu; Jun Yong; et al. (2008)