Drosophila pupa epithelium (IMAGE) Institut Pasteur Caption A Drosophila pupa epithelium showing cell contours (gray) and the reporter of the EGFR-ERK pathway (yellow/purple gradient). Credit © Institut Pasteur / Romain Levayer et Léo Valon Usage Restrictions Please mention full copyright when using this picture: © Institut Pasteur / Romain Levayer et Léo Valon 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.