Hypophysectomy of the adult frog totally inhibits injury-related cell division in the lens epithelium. Two transcorneal freezing injuries are used to decrease the cell density in the lens epithelium of both intact and hypophysectomized frogs. In both intact and hypophysectomized frogs the lens capsule is not breached by the injuries. In the lens epithelium of intact animals, cell death occurs, but hyperplasia ensues and the normal monolayer of epithelial cells is reestablished. In the lens epithelium of hypophysectomized frogs, mitosis does not occur after the two freezing injuries with the result of an overall decrease in cell density of the lens epithelium. Lens epithelial cells elongate with their cytoplasmic processes running parallel to the capsule. In most cases the expanded distal ends of these processes abut other epithelial cells. Various inclusions are noted in epithelial cells from these animals, and their possible derivation is discussed

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