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Photomicrographs of low (left panel) and high (right panel) immunohistochemical protein expression at × 10 magnification (a) thioredoxin (b) thioredoxin reductase (c) thioredoxin interacting protein (d) manganese superoxide dismutase. Stain is 3,3′-diaminobenzidine counterstained with haematoxylin.
