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Fig. 6. cyp26a1 protects against teratogenic effects of the RA
precursor retinal. Wild-type (A) and cyp26a1-/-
(B) embryos injected with 20 pmol retinal at the one-cell stage.
Wild-type embryos are only mildly affected by approximately triple the normal
levels of retinal, whereas cyp26 mutants are strongly posteriorized,
with hoxd4 expression extending throughout the brain. Scale bar: 100
µm.