N3A Receptor Site (IMAGE) University at Buffalo Caption The N3A receptor, as modeled here by the UB researchers, may be silent under normal conditions, but can be reactivated through the unique site (in red) under acidic conditions, such as after a stroke or seizure. Credit Gabriela Popescu and Kirstie Cummings 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.