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Fig 2. Mean T1 values in the 4 subject groups as fitted by the general linear model illustrate how T1 relaxation times increase throughout the normal-appearing white matter (NAWM) when going from control subjects (top row) to primary progressive multiple sclerosis (MS) (second row) to relapsing-remitting MS (third row) to secondary progressive MS (bottom row). The color range represents the T1 range of 700 to 900 ms, as indicated by the color bar.
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