Integration-free iPS cells engineered using human artificial chromosome vectors. oleh Masaharu Hiratsuka, Narumi Uno, Kana Ueda, Hajime Kurosaki, Natsuko Imaoka, Kanako Kazuki, Etsuya Ueno, Yutaro Akakura, Motonobu Katoh, Mitsuhiko Osaki, Yasuhiro Kazuki, Masato Nakagawa, Shinya Yamanaka, Mitsuo Oshimura