Rheumatoid Arthritis (image) Max-Planck-Gesellschaft Caption Mice in which the scientists deactivated the PTP1B protein in B-cells have immune complex deposition (red) in their kidney. The same development could be observed in patients with rheumatoid arthritis. Credit MPI for Immunobiology and Epigenetics/ D. Medgyesi 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.