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Cytokeratin 8/18 is found in the human olfactory tissue and up to one-third of ONB may also stain focally for cytokeratin. ONB involving the upper nasal septum, with a solid growth and vascularized stroma (H&E, a ×10). Inset: higher magnification (×40), arrow pointing focal melanin deposition. b Diffuse immunoreactivity with anti-synaptophysin (b, ×10) and anti-CK8/18 (c ×10)
