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Fig. 6. Expression of Pax2 in wild-type mouse embryos. (A-C) E9 embryos, whole-mount in situ hybridisation. (A,B) Pax8 expression. Arrows show thyroid primordium, arrowheads indicate Pax8 expression in the visceral arches. (A) Lateral view, (B) Cross-section at the level of the thyroid primordium. (C) Pax2 expression, lateral view as in A. (D-F) Neighbouring sections of E15.5 wild-type embryo. (D) Nkx2.1 expression, arrow shows thyroid gland, arrowhead Nkx2.1 expression in the tracheal epithelium. (E) Pax8 expression (arrow shows thyroid gland), (F) Pax2 expression (insert shows positive staining in the CNS on the same section as a positive control). e, Pax2 expression in the eye; fb, Pax2 expression in the forebrain; m, Pax2 expression in the midbrain; n, neural tube; ot, otic vesicle; p, pharynx.