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Group differences in gray matter 11C-PiB SUVRs. (A) Gray matter 11C-PiB SUVR in healthy controls (HC), mild cognitive impairment (MCI), and Alzheimer disease (AD). (B) Gray matter 11C-PiB SUVR in HC and multiple sclerosis (MS). Significant differences (P < 0.05) are indicated by an asterisk.
