Cyclooxygenase-2-positive Cells (IMAGE) Neural Regeneration Research Caption At 12 hours after fluid percussion injury, cyclooxygenase-2-positive cells (arrows) in rat hippocampal neurons were increased, as shown by immunocytochemical staining. Credit Neural Regeneration Research 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.