Eph-Receptors (image) Max-Planck-Gesellschaft Caption Countless Eph receptors (green) can be found on the surface of this neuron. When they are artificially induced to form groups, the nerve process, or axon (red tip), withdraws. Credit MPI of Neurobiology / Dudanova Usage Restrictions None 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.