Neuropsin in the Retina (IMAGE) Johns Hopkins Medicine Caption Neuropsin (in blue) was found in nerve cells in the retina of a genetically engineered mouse. Credit Wendy Yue, Johns Hopkins Medicine 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.