Astrangia coral with dinoflagellates (IMAGE) Marine Biological Laboratory Caption Darkfield imaging is used to reveal the non-autofluorescent coral tissue in the Northern Star coral (Astrangia poculata), a species with no intrinsic fluorescence. Non-fluorescent tissue (cyan) and dinoflagellates (magenta) are combined in the image. Credit Philippe Laissue, Scientific Reports, 2020 Usage Restrictions Please use with proper credit. 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.