Neural development. An embryo of E. coloradorum is shown in A, embryos of E. randi are shown in B and C, and embryos of G. riobambae are shown in D–F. (A) Dorsal view of a tailbud embryo immunostained against NCAM. The streams of CNC were faintly stained. (B) Lateral view of a tailbud embryo immunostained against antigen 2G9. (C) Dorsal view, in higher magnification, of the embryo in B. (D) Dorsal view of a st-17 embryo immunostained against NCAM. (E) Dorsal view of a st-17 embryo immunostained against antigen 2G9. The streams of cnc extend laterally in the flat embryo of G. riobambae. (F) Drawing of the antigen 2G9 expression in st-17 embryos of G. riobambae, modified from ref. 31. ba, branchial anterior stream of cnc cells; bp, branchial posterior stream of cnc cells; h, hyoid stream of cnc cells; m, mandibular stream of cnc cells; nt, neural tube; o, optic vesicle; r3, rhombomere 3; r5, rhombomere 5; tnc, trunk neural crest. [Scale bars: 200 μm (C); 250 μm (A); and 500 μm (B, D, and E).]