Zebrafish Fin Regeneration (IMAGE) University of Oregon Caption Green fluorescent proteins show where bone-building is occurring in the regeneration of a zebrafish caudal fin that had been amputated. Complete repairs begin at the tail's base and gradually proceed to the tip, a process that is completed within two weeks. Credit (Courtesy of Kryn Stankunas) Usage Restrictions Use credit 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.