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Fig. 6. Stem zone gene expression in FGF- and retinoid-deficient embryos. SU5402, but not DMSO, leads to loss of Hoxb8 expression (A,B). Vitamin A-deficient (VAD) quails commence expression of Sax1 (C,C') and Hoxb8 (D,D') in the stem zone as in normal quail embryos.