Sheila Singh and William Gwynne (IMAGE) McMaster University Caption Sheila Singh (left) and first author and a post-doctoral researcher William Gwynne Credit McMaster University Usage Restrictions to be used when reporting on this research 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.