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Caps are dark regions (arrow) at the edge of muscle fibers stained with Gomori trichrome, H&E, VvG and Desmin | |
 Gomori trichrome stain |
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 H & E stain |
 VvG stain |
 Desmin Immunocytochemistry |
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 ATPase pH 9.4 stain Caps do not stain on ATPase pH 9.4. |
 NADH stain Caps do not stain on NADH in this patient. |