Hybrid Electrocataluyst (image) University of South Carolina Caption An enzyme-free detection system was used to quantify just a handful of circulating tumor cells. Comprising Fe3O4 beads decorated with bimetallic nanocages, the hybrid electrocatalyst is a hardy alternative to the natural enzyme horseradish peroxidase for cytosensing. Credit American Chemical Society Usage Restrictions None 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.