The Nervous System of the Male C. Elegans (IMAGE) Columbia University Caption The nervous system of male roundworms is distinct from that of females. Some of the neurons that only exist in one sex are labeled with green and red fluorescent proteins. Credit Laura Pereira and Esther Serrano-Saiz. 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.