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Fig. 3. Xanx-4 mRNA is localised to the pronephric tubules. (A)Whole-mount (stage 36) and (B) section (stage 42) in situ hybridisation of an Xanx-4 DIG-labelled antisense RNA probe. Expression of Xanx-4 is restricted to the pronephric tubules. The control sense probe showed no staining pattern (data not shown).