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Fig. 5. Expression of TId1 (A) and TId2 (B) in trout embryo. (A) Stage 16 embryo (45 somites), lateral view. Transcripts for TId1 are localized in the tail bud (arrow), paraxial mesoderm and transiently in the ventral and dorsal extremes of the neoformed somites (arrowheads). (B) Stage 16 embryo (40 somites), lateral view. Transcripts for TId2 concentrate in the dorsal domain of the somites (black arrowheads). A strong signal is also apparent in the pronephros (white arrowheads). Scale bars: A, 300 µm; B, 250 µm.