FIG. 5.
Light microscopy appearance of cortex sections processed for histoautoradiography. Animals were treated for 10 days with gentamicin (10 [A] or 20 [B] mg/kg). Bars, 20 μm. Each animal received 200 μCi of [3H]thymidine 1 h before sacrifice for the demonstration of DNA synthesis in S-phase cells (arrowheads).