How is a auto immune disease caused mention one such disease in humans 2?
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Rheumatoid arthritis (RA) In rheumatoid arthritis (RA), the immunesystem attacks the joints. This attackcauses redness, warmth, soreness, and stiffness in the joints. Unlike osteoarthritis, which affects people as they get older, RA can start as early as your 30s (6).
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