Problem
Read the research paper by Strong et al. entitled "Xbra3 Induces Mesoderm and Neural Tissue in Xenopus laevis" and answer the questions below.
1. When comparing vertebrate neural determination with that in invertebrates like Drosophila, how are the systems different and how are they similar?
2. What are two possible explanations for how Xbra3 induces mesoderm?
3. How do the authors determine that Xbra3 protein is localized specifically in nuclei? Explain.
4. What are the overall conclusions that the authors make about Xbra3 function?