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Pan-keratin immunostaining in tumors. The panels show a cytoplasmatic pan-keratin immunostaining of variable intensity in samples from a colorectal adenoma (A: strong staining), two clear cell renal cell carcinomas (B: strong; C: weak), a sarcoma NOS (D: strong), an angiosarcoma (E: strong), a gastrointestinal stromal tumor (GIST) (F: moderate), and a seminoma (G: weak). Pan-keratin immunostaining is lacking in an adrenocortical carcinoma (H).
