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Amyotrophic lateral sclerosis (ALS) is a neurodegenerative disease that affects neurons in the brain and spinal cord causing loss of muscle control. Scientists have now suggested a potential therapeutic strategy to tackle this pathology that has no treatment to date. It is a molecular trap that prevents one of the most common genetic ALS-causing peptide compounds, the Poly-GR dipeptide, from causing its toxic effects in the body. The results show that this strategy reduces the death of neurons in patients and in an animal model (vinegar flies) of the disease.