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Doublecortin （DCX） is a microtubule-associated protein expressed by neuronal precursor cells and immature neurons in embryonic and adult cortical structures. In vivo and in vitro assays show that Doublecortin stabilizes microtubules and causes bundling. Doublecortin is a basic protein with an iso-electric point of 10 typical of microtubule-binding proteins. Doublecortin is mutated in X-linked lissencephaly and the double cortex syndrome, and the clinical manifestations are sex-linked. In males, X-linked lissencephaly produces a smooth brain due to lack of migration of immature neurons, which normally promote folding of the brain surface. Double cortex syndrome is characterized by abnormal migration of neural tissue during development which results in two bands of misplaced neurons within the subcortical white, generating two cortices, giving the name to the syndrome; this finding generally occurs in females. At least 49 disease-causing mutations in this gene have been discovered.