Functioning Eye in Back of Frog Embryo (IMAGE) Tufts University Caption Changing the bioelectric voltage in embryonic frog cell in tadpole's back caused cell to develop into a functioning eye. Credit Michael Levin and Sherry Aw Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.