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Mouse cerebellum stained to reveal a Purkinje neuron (green), by researchers studying the expression of ALS-associated genes in the brain. For the first time, the scientists discovered that the C9orf72 gene is strongly expressed in the hippocampus of the mouse brain – a region where adult stem cells reside and which is known to be important for memory. Image credit: Andrew L Bashford and Vasanta Subramanian University of Bath.