Top journal retracts 'game-changer' stem-cell study
The announcement on Wednesday came after mistakes were discovered in some data published in two papers, photograph captions were found to be misleading
Japanese researcher stands by her disputed stem cell discovery
The papers published by Haruko Obokata in the scientific journal Nature in January detailed simple ways to reprogramme mature animal cells back to an embryonic-like state, allowing them to generate many types of tissues