SEVEN DAYS

摘要

Stem cells that researchers claimed to have created by exposing ordinary cells to stress were probably embryonic stem cells that had been introduced into lab samples, according to an investigation of the claims. The RIKEN Center for Developmental Biology in Kobe, Japan, where the original claims were made, commissioned the investigation by outside experts. In a report released on 26 December last year, investigators noted the improbability of accidental contamination, but said that they could not determine whether misconduct had occurred.