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Fig 3. Cerebral lobar GM volumes in monozygotic twins discordant for the RTT phenotype. Note that the unaffected twin showed frontal, parietal, and temporal GM volumes within the normal control range (depicted as mean +1 SD), whereas the affected twin had smaller volumes in these regions, with the exception of the occipital GM volume, which was at nearly identical levels in both twins and only slightly below the normal control range.
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