Studies Identify Spinal Cord Neurons that Control Skilled Limb Movement (image) Columbia University Medical Center Share Print E-Mail Caption Normal mice move their limbs smoothly when reaching for food pellets. The limbs of mice without the GABAergic interneurons (red line) displayed severe tremors. Credit Nature and lab of Thomas M. Jessell, PhD Usage Restrictions May be used within the context of this story. 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.