Final answer:
Autoimmune diseases occur when the immune system fails to recognize the body's own molecules as self, leading to an attack on healthy cells.
Explanation:
Autoimmune diseases occur when the immune system fails to recognize the body's own molecules as self, leading to an attack on healthy cells. This results in tissue damage, altered organ function, and various autoimmune disorders. For example, diseases like rheumatoid arthritis, type 1 diabetes mellitus, multiple sclerosis, and systemic lupus erythematosus fall into this category.
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