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Abnormal expression of MusD/ETn elements in dactylaplasia mutant limb buds. In situ hybridization to assess MusD/ETn and Fgf8 expression in whole embryos and their anterior limb buds collected at E10.5 and the representative phenotype of each genotype. Arrows indicate aberrant expression in the AER of the dactylaplasia mutant limb bud.
