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Graphical view of aligned and size-normalized ventricles. (Left) Superior view of left ventricles of five MZ twin pairs (Upper) and five DZ twin pairs (Lower) displayed from the top. Ventricles of co-twins are shown by using the same color. (Right) Sagittal view of right ventricles of 10 DS pairs, with affected and unaffected shown side by side. The third pair (Upper Right) was excluded because of hydrocephaly in the unaffected twin.
