NELL2 Repels (IMAGE) Brown University Caption The red-stained cells in the frame on the left do not express the axon-repelling protein NELL2, but the red cells in the frame on the right do. Credit Alexander Jaworski/Brown University Usage Restrictions with credit 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.