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Fig. 1. Thyroid development is impaired in hands off mutant zebrafish embryos. Anterior is to the left. Stages are indicated bottom left, genotype top right and staining/marker bottom right. Arrows show thyroid primordium; arrowheads show pharyngeal endoderm. Ventral (A,B,Q), dorsal (C,D) and lateral (E-P) views are shown. T4 (thyroid hormone) immunostaining (A,B,Q) and in situ hybridisation (C-P). (A,B) In han^s6 embryos, no T4-producing follicles are detectable. (C,D) Pharyngeal endoderm appears to be normal in han^s6 mutants. (E-K) Expression of thyroid developmental markers. (L-N) The thyroid differentiation marker slc5a5 is expressed in approximately 10% of han^s6 mutant embryos. (O-Q) In han^c99 mutants, both primordium and differentiated thyroid are reduced. hy, hypothalamus; mhb midbrain-hindbrain boundary.

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