Fluorescent Microscope (IMAGE) University of North Carolina Health Care Caption A fluorescent microscope image shows that in a population of genetically identical. The cell in green is expressing a green-fluorescent protein that is expressed by cells that are able to take up DNA from the environment. Credit Adam Rosenthal et al. Usage Restrictions Credit must be given to the creator. License CC BY 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.