1 Center for iPS Cell Research and Application, Kyoto University, Kyoto, Japan. Electronic address: peter@cira.kyoto-u.ac.jp.
2 Center for iPS Cell Research and Application, Kyoto University, Kyoto, Japan.
3 Center for iPS Cell Research and Application, Kyoto University, Kyoto, Japan; Gladstone Institute of Cardiovascular Disease, San Francisco, CA, USA. Electronic address: yamanaka@cira.kyoto-u.ac.jp.