Flatworm Regeneration Image Representations (image) NASA/Johnson Space Center Share Print E-Mail Caption These are image representations of live worms with single, bipolar, triple and quadruple heads for the Flatworm Regeneration investigation aboard the International Space Station. Credit Dr. Michael Levin, Tufts University Usage Restrictions For news coverage in connection with this news story. Share Print E-Mail 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.