Detecting Tumor Markers Easily (image) Fraunhofer-Gesellschaft Caption The concentration of biological molecules in a sample can be observed visually using laser-stimulated fluorescence. Credit Faunhofer IPA Usage Restrictions The picture may be used for editorial purposes only. It is protected by copyright. The use is free of charge if the reference is mentioned. 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.