Type 1 diabetes, multiple sclerosis, rheumatoid arthritis, systemic lupus erythematosus, vitiligo, Crohn's disease and Guillain-Barré syndrome – these seemingly different diseases all have one thing in common: they occur when a deregulation of the immune system causes it to “attack” the body that it is supposed to be protecting.

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Photo: Interaction between a lymphocyte and a dendritic cell