Fig. 1From: Evaluation of the expression of Bmi-1 stem cell marker in sinonasal melanomas and its correlation with the expression of cell cycle proteinsSinonasal melanoma: a and b – histopathological features: tumor composed of small undifferentiated cells (a), which form a cuff surrounding a blood vessel (peritheliomatous arrangement). c and d – immunohistochemical findings: nuclear expression for Bmi-1 (c) and nuclear and cytoplasmic expression for p16 (d) are seen in most tumor cellsBack to article page