Alpha-Defensin 6 in Action (IMAGE) University of California - Davis Health Caption Scanning electron micrographs show Salmonella bacteria in the absence of defensin (left) and in the presence of HD6 (right). Prominent net-like fibers of HD6 entwine and agglutinate the bacteria, preventing them from invading cells. Credit Copyright 2012, Science. Usage Restrictions Image may only be used with appropriate caption or credit. 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.