photoswitching fingerprint (IMAGE) University of Würzburg Caption The photoswitching rates of fluorescent dyes are as unique as a fingerprint and as readable as a barcode. Credit Beliu, Rudolf Virchow Center Usage Restrictions no restriction 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.