Three Rotting Heads (image) University of Leicester Caption These are three rotting heads. A sequence of images showing how the characteristic features of the body of amphioxus, a close living relative of vertebrates, change during decay. Colors are caused by interference between the experimental equipment and the light illuminating the specimens. Credit Mark Purnell, Rob Sansom, Sarah Gabbott, University of Leicester Usage Restrictions Use only with appropriate accreditation. 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.