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Expression of TH components during early chick development. In situ hybridizations were performed on serial cryosections cut in the coronal plane at three different stages of chick development (Stage 20 [A-D], Stage 24 [E, F] and Stage 26 [G, H]) for Dio3 (A, C, E, G) and TRb (B, D, F, H).The images in C and D are more centrally derived sections from an independent Stage 20 chick.
