mdkb regulates early pax3 expression. A: Lateral view of pax3 expression in a control embryo at 80% epiboly (dorsal to the right). B: Reduced pax3 expression in embryo co-injected with mdkb Up and Down splice-site Morpholinos (MOs). The arrow marks an area with reduced pax3 expression. C: Expanded pax3 expression in an embryo injected with 150 pg of mdkb mRNA. The arrow marks a region of expanded pax3 expression, the arrowhead the anterior border of pax3 expression. D,E: otx2 expression in the anterior neural plate of control (D) and mdkb MO-injected embryos (E) at 90% epiboly. Note that the otx2 region is slightly expanded, suggesting that neural plate is not reduced in mdkb morphants.
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