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Normal canine pituitary gland (A-D) and canine ACTH-secreting pituitary adenomas (E-T) stained with Haematoxylin/Eosine (A, E, I, M and Q), ACTH (B, F, J, N and R), EGFR (C, G, K, O and S) and USP8 (D, H, L, P and T). The ACTH-secreting pituitary adenomas have been stratified according to their nuclear USP8 staining from H-score 3 (H) to H-score 0 (T). Scale bars = 20μm.
