Zebrafish (IMAGE) Johns Hopkins Medicine Caption Zebrafish larvae and fluorescently marked immune cells allow researchers to track immune system activity in a model of retinal degeneration. Credit David White, Mumm Lab, Johns Hopkins University School of 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.