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Figure 4


Fig. 4. Hox gene expression in LRE and LRE+RARE mutants. Expression of (A-C) Hoxa3, (D-F) Hoxd3, (G-I) Hoxb4 and (J-L) Hoxd4 in E9.5 wild-type (A,D,G,L), LRE mutant (B,E,H,K) and LRE+RARE mutant (C,F,I,L) mouse embryos. The rostral somitic expression boundary (arrows) was posteriorized by one somite for each Hox gene examined in both mutant backgrounds, as compared with wild-type controls. S, somite.