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Fig. 7. Expression pattern of Xenopus HS2ST and HS6ST in the embryonic brain. (A,B) Lateral views of brains (stage 39) after whole-mount in situ hybridisation with antisense HS2ST (A) and HS6ST (B) RNA probes. Retinal axons are stained with HRP in (B). Arrows and arrowheads indicate the borders of the diencephalon/tectum and tectum/hindbrain, respectively. (C,D) Control embryos hybridised with sense probes.