<em>Caenorhabditis Elegans </em>Roundworms (IMAGE) Princeton University, Engineering School Caption Princeton researchers have produced a comprehensive view of which genes are active in each of the four major tissues of the adult roundworm Caenorhabditis elegans, a model for studying the biology of multicellular organisms. Credit Image courtesy of the researchers. Illustration by Neil Adelantar. Usage Restrictions Noncommercial use 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.