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Proliferation of Schwann cells in neonatal mouse sciatic nerve was studied radioautographically in 1-micro glycol methacrylate sections. 28 mice were injected with thymidine-(3)H, 4 microc/g, 48 hr after birth, and were killed serially over the next 4 days. For the cell cycle following injection, the generation time was approximately 24 hr as determined by grain-count halving data; the duration of synthesis phase was 8 hr as determined from a curve constructed from the per cent of mitotic figures containing label; and the labeling index was 9% at 2 hr after injection. With these estimates, the per cent of Schwann cells proliferating was calculated to be 27%. In addition, roughly 25% of dividing cells appeared to cease division during the cell cycle under study. The relationship of these findings to other events during maturation of nerve is discussed.

SCHWANN CELL PROLIFERATION IN DEVELOPING MOUSE SCIATIC NERVE