Roadmap (image) Johns Hopkins Medicine Share Print E-Mail Caption This is a roadmap to cellular development. This branching structure allows researchers to see the genes turned on and off over the lifetime of a cell. Credit Loyal Goff. Work by Brian Clark, Genevieve Stein-O'Brien, Fion Shiau, Gabrielle Cannon, Emily Davis, Thomas Sherman, Fatemeh Rajaii, Rebecca James-Esposito, Richard Gronostajski, Elana Fertig, Loyal Goff, and Seth Blacksha Usage Restrictions None Share Print E-Mail 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.