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Fig. 4. FGF8 cannot rescue the effects of XRAR{alpha}2.2 loss-of-function on posterior marker genes. Embryos were microinjected at the two-cell stage with the indicated reagents, allowed to develop until controls reached stage 18 and processed for whole-mount in situ hybridization with either HOXB9 (A-E) or XCAD3 (F-J) probes.