Improved Reporter Virus (IMAGE) Texas Biomedical Research Institute Caption Left: In a previous study, Texas Biomed researches tried swapping out a viral gene with a gene for green fluorescent proteins, but that did not result in enough proteins being expressed. Right: In this study, they inserted the fluorescent protein gene next to the most expressed protein of SARS-CoV-2, and that worked very well. Each green spot is reporting one viral particle. Credit Texas Biomed Usage Restrictions Image may be used with caption and credit. License Original 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.