Fig. 2. COUP-TFI is expressed in GABAergic interneurons, while COUP-TFII is expressed in Cajal-Retzius cells. Double immunofluorescence of COUP-TFs (green) and cell-type-specific markers (red) in coronal sections of E13.5 (A-G) and E15.5 (H,I) mouse brains. COUP-TFI (A,B), but not COUP-TFII (D,E), co-labels with calbindin in the MZ of the ncx (A,D) and of the pcx (B,E). COUP-TFII (F,G,H), but not COUP-TFI (C,I) co-labels with reelin in the MZ of the neocortex (C,F) and in the caudomedial cortical wall (G-I). The inset in G is a schematic diagram of the section, and indicates the position of panels (G-I). The arrows indicate double-positive cells. Note that in H, all the cells are double positive, while in I none of the cells are double positive. MZ, marginal zone; ncx, neocortex; pcx, piriform cortex.