Spindle indices (SI) of individual cells were calculated from at least 200 cells per treatment from a minimum of three images as the ratio of length (l) to width (w); SI = l/w of each cell. Cells with SI < 3 were considered as epithelial. The percentage of cells <3 were calculated as the ratio of the number of cells with spindle index <3 to the total number of cells per image. The method was adopted from reference (30). Length and width were measured using the Image J software, U. S. National Institutes of Health, Bethesda, Maryland, USA.
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