light microscopic autoradiographic studies of [ 3h ] thymidine labeled samples demonstrated that ( 1 ) clones of spermatogenic cells traverse s phase synchronously , ( 2 ) sertoli cells are not significantly radiolabeled , probably because of contact inhibition achieved by high cell plating density , and ( 3 ) peritubular cells are significantly [ 3h ] thymidine labeled in the presence of tkm , a culture medium that facilitates spermatogenic cell long-term viability and differentiation .
C0007634
cells
C0007589
differentiation