V2b Interneurons (IMAGE) Salk Institute Caption V2b interneurons, responsible for a key locomotion circuit, appear as green with yellow nuclei in a spinal cord while all other neurons are red. Credit Courtesy of the Salk Institute for Biological Studies 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.