DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Hand and lower arm of an adult female patient, showing the wrist affected by rheumatoid arthritis. The wrist joint has become inflamed, stiff, and may deform in shape. Rheumatoid arthritis is caused by the immune system attacking the body's own tissues causing progressive joint and cartilage destruction of the bones.
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