Figure 6. Loss of the chained undifferentiated spermatogonia in VRK1-deficient testes.

(A) Five-week-old testes of wild-type and VRK1-deficient mice were examined by whole-mount immunostaining with anti-Plzf antibody. Scale bars, 10 µm. (B) Frequency of the undifferentiated spermatogonia clusters classified by the number of chains of cells. 160 (wild type) or 162 (VRK1-deficient testes) clusters that were clearly identified were counted.