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Fig. 3. FGF genes are upregulated or ectopically expressed on the lingual side
of Spry4-/-;Spry2+/- and
Spry4-/- embryonic incisors. (A-K) Gene
expression was analyzed by RNA in situ hybridization using the probes
indicated on paraffin sections of E16.5 incisors of the genotypes denoted.
Yellow asterisks indicate gene expression domains in the mesenchyme, and
arrows point to the anterior and posterior ends of gene expression domains in
the epithelium. All samples are shown at the same magnification.