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Correlation between monkeys’ ages and mean QSM values of subcortical areas. Each circle indicates the mean QSM value of individual subcortical ROIs and the dash line represents regression slope. Abbreviations: DN, dentate nucleus. GPe, globus pallidus external segment. GPi, globus pallidus internal segment. SN, substantia nigra. STN, subthalamic nucleus. VP, ventral pallidum. ppb, parts per billion.
