Close up of graphene sensor (IMAGE) University of California - San Diego Caption A close up of the silicon well in the biosensor with the graphene-based transistor at the bottom. Credit David Baillot/University of California San Diego Usage Restrictions Please credit 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.