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Fig. 3. A–C are dorsal views of albino Xenopus embryos at stage
24/25. Anterior is at the top of the page. A: Normal left-sided Xnr-1
expression. B: Bilateral expression of Xnr-1 in the lateral plate
mesoderm and somites of an embryo injected in the right lateral plate
mesoderm with 25 ng of human recombinant activin A. C: Symmetric
expression of Xshh in the neural tube/floorplate of an embryo injected
with 25 ng of activin into the right lateral plate at stage 20. Right
lateral view of embryo (on right side of panel) indicates no ectopic Xshh
expression. D: Expression of Xenopus activinbB at stage 20. (Top
embryo - dorsal view with anterior towards the top of the page; bottom
embryo - left lateral view). No consistent asymmetries of expression
are noted. |
