Implant devices (IMAGE) University of British Columbia Caption The dose-delivering unit (bottom) is about seven centimetres long and implanted along with asmaller sentinel device (top right). They are shown in comparison to a U.S. quarter. Credit ViaCyte Usage Restrictions none License Original 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.