Evaluation of the reproducibility and positive controls of cellular immortality test for the detection of immortalized cellular impurities in human cell-processed therapeutic produ... oleh Takamasa Hirai, Ken Kono, Shinji Kusakawa, Satoshi Yasuda, Rumi Sawada, Akihiko Morishita, Shinko Hata, Atsushi Wakita, Takayasu Kageyama, Ryo Takahashi, Sono Watanabe, Norihiko Shiraishi, Yoji Sato