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Scientists are trying a revolutionary new approach to treat rheumatoid arthritis, multiple sclerosis, lupus and other devastating autoimmune diseases — by reprogramming patients’ out-of-whack immune systems.

When your body’s immune cells attack you instead of protecting you, today’s treatments tamp down the friendly fire but they don’t fix what’s causing it. Patients face a lifetime of pricey pills, shots or infusions with some serious side effects — and too often the drugs aren’t enough to keep their disease in check.

“We’re entering a new era,” said Dr. Maximilian Konig, a rheumatologist at Johns Hopkins University who’s studying some of the possible new treatments. They offer “t

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