Yoshiki Sasai, supervisor of 30-year-old scientist Haruko Obokata of Riken Institute, answers questions during a press conference in Tokyo on April 16, 2014. Obokata was feted as a modern-day Marie Curie after unveiling research that showed a simple way to re-programme adult cells to become a kind of stem cell, a breakthrough that could provide a ready supply of the base material for transplant tissue. But Riken has since distanced itself from the study, which was published in the British journal Nature, after it came to light that some of Obokata’s data was faulty. AFP PHOTO/Toru YAMANAKA (Photo credit should read TORU YAMANAKA/AFP/Getty Images)