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Gray Matter by Age Slope Differences. (A) voxel-wise group by age interaction was found in a small cluster in the retrosplenial aspect of the posterior cingulate, indicating that the effect of age on gray matter atrophy differs as a function of group. (B) Plot of the effect indicating a greater negative slope with age in the VL/VL group. Note the y-axis is statistically adjusted GM, and thus should not be interpreted strictly as absolute gray matter.
