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Universidad Carlos III de Madrid) A tissue bioengineering product based on patient cells that have been corrected using genomic editing has been designated as an orphan drug by the European Medicines Agency (EMA) for the treatment of Recessive Dystrophic Epidermolysis Bullosa. The condition, known as Butterfly's Skin, is characterised by the appearance of fragile skin and mucosal epithelium, ulcers and aggressive skin carcinomas.