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No two nerve cells will always be connected in the same way in different people‚Äôs brains. (Medicine and Science. Fragile X, Down syndromes linked to faulty brain communication.)

In Fragile X, Downs, and perhaps in Autism, the genetics differ but the end result for the brains appear to be similar. The gene Fmr1 located on the X chromosome, influences neurons to be less likely than normal cells to reach out and form connections, or synapses, with their neighbors. Fewer cells are making connections. (Medicine and Science. Fragile X, Down syndromes linked to faulty brain communication.)