Experimental Device (IMAGE) CNRS Caption A multiwell plate where each well contains tumor tissue is placed on an inverted microscope held at 37°C. A laser beam is focused on one area of the tumor, then moved to achieve a mapping. The diffused light is collected by the microscope lens and analyzed in an interferometer to detect wavelength variations (in other words, "color" variations). Credit Jérémie Margueritat/ILM/CNRS Usage Restrictions May only be used to report on this research, with appropriate credit and caption. 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.