Figure 8.

Pioneer neurons in the preplate co-expressed Tbr1 in rats and mice. (A–C) CB⁺ preplate cells co-expressed Tbr1; E15.5 rat. Arrowheads signal co-labeled cells. Overlay is shown in the boxed area (C). CB⁺ cells in the intermediate zone (arrows), possibly migrating interneurons, were Tbr1-negative. CB⁺ cells in the ventricular zone (in A) were also Tbr1-negative. (D) L1⁺/Tbr1⁺ cells in the E12.5 mouse preplate. (E) TAG-1⁺/Tbr1⁺ cells in the E12.5 mouse preplate. Single confocal sections. Calibration bar, 50 μm, in (A).