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Summary. Heterogeneous populations of developing mouse spermatozoa were isolated from the seminiferous tubules and suspended in media of varied ionic composition. Tracer-flux analysis showed that PNa/PK in developing spermatozoa is 0\m=.\7which is relatively high and that permeability of the cells to potassium and sodium is dependent on the ionic concentration of the medium.

Tracer-flux analysis of sodium and potassium permeability in differentiating mouse spermatozoa