Nerve growth factor receptors (IMAGE) New York University Caption Nerve growth factor receptor TrkA (in green) and co-receptor NRP1 (in purple) are coexpressed in the same nerve cells in mice. Credit Bunnett Lab Usage Restrictions use with credit and caption License Original 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.