basing on the electron-microscopic and histochemical studies of 29 skin tumours with a histological diagnosis of non-differentiated squamous cell carcinoma of the skin it was found that 21 tumour in line with non-differentiated cells contained a small number of tumour cells with ultrastructural and histochemical features of differentiated keratinocytes of the epiderm or from the externa tunica of hair follicles .
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differentiated