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Regional brain volumes normalized to total intracranial volume (ICV) are plotted in relationship to age across the three subject groups (Down syndrome (DS) in red, typical development (TD) in green, and William syndrome (WS) in blue) in (a) left inferior parietal lobe, (b) left pars orbitalis, (c) left superior parietal lobe, and (d) right post central gyrus.
