Human DRG (image) Duke University Share Print E-Mail Caption Sensory neurons from human dorsal root ganglia, a collection of nerves and neurons near the top of the spinal cord, show red for PD-1, a binding site for immunotherapies against cancer. The blue stain shows cell nuclei. Credit Ru-Rong Ji Lab, Duke University Usage Restrictions Please credit. 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.