Novel iron sensor (IMAGE) University of Texas at Austin Caption Schematic of a novel iron sensor. When a short strand of DNA called a DNAzyme (green) binds to a specific form of iron (e.g., Fe3+ or Fe2+), the DNAzyme cuts a second strand of DNA (red) and releases a fluorescent signal (yellow) that indicates visually the presence of the specific form of iron. Credit David Steadman/University of Texas at Austin Usage Restrictions none 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.