The French Flag Model (IMAGE) Center for Genomic Regulation Caption The French Flag model of stripe formation: source cells secrete a signal. Receiver cells "read" the signal concentration and make red, white or blue stripes by expressing genes. Credit CRG Usage Restrictions None 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.