Figure 1b from retracted article:
Obokata, Haruko, Teruhiko Wakayama, Yoshiki Sasai, Koji Kojima, Martin P. Vacanti, Hitoshi Niwa, Masayuki Yamato, and Charles A. Vacanti. 2014. “Stimulus-Triggered Fate Conversion of Somatic Cells into Pluripotency.” Nature 505 (7485) (January): 641–647.