| Abstract: | Abstract— Measurements of epidermal hyperplasia induced by UV in albino mice, using an improved method of sampling and counting of cells, show wide variability attributable largely to basic uncertainty rather than experimental error. Factors are analyzed that may contribute to the infeasibility of determining simultaneously the size of cell population and rate of cell duplication, including recovery of cell activity enhanced by photoreactivation. A hyperplasia-inducing factor is isolated from epidermis exposed to UV. |
