Figure 3. Proliferating cells in the ventricular zone and the migration of newborn cells along the radial glia fibers.

A and B: [³H]-thymidine-labeled cells in the ventricular zone overlying the developing HVC after two hours administration of [³H]-thymidine at post-hatch day 15 in a male (A) and female (B). C: Comparison of the number of [³H]-thymidine-labeled cells per mm along the ventricular zone between the two sexes. D–H: The migration of [³H]-thymidine-labeled cells along vimentin-immunoreactive radial glia fibers within the developing HVC in males (D and F) and females (E and G) at post-hatch day 21 or 26. H: Comparison of the number of [³H]-thymidine-labeled cells along radial glia fibers per mm² within the developing HVC between the two sexes. ** indicates P<0.001. Scale bar = 100 µm (A, B, D–G) and 40 µm (all inserts).