Fluorescent Probes at Work (IMAGE) Indiana University Caption Regions of active cell wall synthesis are shown by high-resolution imaging of the bacterial pathogen Streptococcus pneumoniae. Long-term labeling is revealed with blue FDAA and short-time labeling with red FDAA. Credit Photo by Michael Boersma - Indiana University 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.