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TK1 expression in normal and neoplastic tissue samples: (a,b) normal breast tissue sample with no expression of TK1; (b,c) BC tissue sample with moderate to strong cytoplasmic TK1 expression. (a,c) Hematoxylin and eosin staining. (b,d) IHC staining for TK1 (see text). Magnification for all images is 200×.
