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Fig. 8. Model for the role of nls/raldh2 in patterning the posterior head
and neural tube. High local concentrations of RA are required for patterning
of posterior axial and paraxial head mesoderm, survival of posterior neural
crest cells, and induction of gene expression in the neural tube. Dorsal
schematic view of an idealised zebrafish embryo during early segmentation
stages with anterior to the left.
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