Fig. 2. In situ hybridization of Rax (A-D,I-L) and RaxL (E-H,M-P) on retinal sections of E5 (A,E), E6 (B,F), E7 (C,D,G,H), E9 (I,M), E11 (J,N), E14 (K,O), and E19 (L,P) chick embryos. (C,G) Sections from the peripheral region; (D,H) sections from the central region of the E7 retina. GCL, ganglion cell layer; INL, inner nuclear layer; IPL, inner plexiform layer; ONL, outer nuclear layer; RPE, retinal pigment epithelium. In B and F, arrows indicate Rax and RaxL non-expressing domains, respectively. In H, strong expression of RaxL in developing photoreceptor cells is indicated by an arrow and the weak expression zone in INL is indicated by an arrowhead.