Fig 1: Photomicrographs of transverse sections through the developing and adult telencephalon of Xenopus laevis (A–J) and Trachemys scripta elegans (K–O). Ventricular expression is detected in the MP (filled arrowheads) and mantle (empty arrowheads), in prometamorphic larvae (A,B) of Xenopus and, adult (C). This localization is confirmed by the combination of Ctip2 with Er81, detected in the DMP (D). Expression of Cux2 (E), Mef2c (F,G) and EGFR (H–J) are localized in adult X. laevis in the MP region. Ctip2 expression in developing T. scripta is observed in MCx and in DMCx (K), whereas in the adult was observed mainly in the MCx (L,M), as well as Cux2 in developing (N) and in adults (O). In each panel, the developmental stage and the color code for the used markers are indicated. Filled arrowheads point to ventricle-expressing cells and empty arrowheads to mantle-expressing cells. Scale bar in panels (A,C–O) = 200 µm and (B) = 100 µm. See the abbreviation list.