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A genetically heterogenous syndrome that may be caused by mutation(s) in the HESX1, OTX2, and SOX2 genes, encoding homeobox expressed in ES cells 1, homeobox protein OTX2, and transcription factor SOX-2, respectively. Clinical features may include hypoplasia of the optic nerve(s), impaired vision, absence of the septum pellucidum, hypopituitarism, and behavior disturbances.
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