ectoderm (epidermis ectoderm (neural plate notochord D-V patterning can blastopore lip be studied in the somites lateral plate yolk frog embryo. endoderm (B) brain spinal cord blastopore (C) Figure 21-71 part 2 of 2. Molecular Biology of the Cell, 4th Edition. Fig 2D-V patterning can be studied in the frog embryo. Fig. 2