Expression of cyclin K is developmentally regulated during spermatogenesis.

<p>A) Schematic presentation of cell types and key events during neonatal and adult spermatogenesis in mice. B) Expression of CycK detected by IHC at different stages of spermatogenesis. Representative results from four independent experiments were shown. Asterisks denote spermatocytes. Scale bar: 20 µm.