Figure from paper (IMAGE) Optica Caption Researchers have developed a system that uses dual-wavelength light to provide information about tumor depth in healthy tissue. Credit Christine M. O’Brien, Washington University in St. Louis 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.