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Fig. 5. Expression of molecular markers in noi–/– mutant and sibling embryos. (A,B,E,F) hhex expression, (C,D,G,H) nk2.1a expression, (I,J) pax8 expression, (K-N) pax2.1 expression. Embryo age is indicated in the bottom left-hand corner. The arrows indicate the thyroid primordium.