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Myelin deficits persist in the brain of the mature dog. The trapezoid body close to the pia in the 11 month old Chow. This structure—which is normally completely myelinated—shows a paucity of myelin (A) and on higher power, many non-myelinated axons can be seen (B). Scale bars, A = 20 μm, B = 10 μm. [Color figure can be viewed in the online issue, which is available at wileyonlinelibrary.com.]
