Correlations between intensity of staining for proteolipid protein in non-lesional tract white matter and tractography-derived diffusion-weighted MRI metrics, excluding tract-lesion overlap. Correlations (Pearson’s partial correlation coefficient corrected for post-mortem interval and age) between (A) tract fractional anisotropy and tract myelin proteolipid protein stain intensity and (B) tract mean diffusivity and tract myelin proteolipid protein stain intensity. T = light transmittance.
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