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Since thyroid-stimulating hormone (TSH) producing cells are thought to play an essential role during metamorphosis, their development was immunohistochemically examined to reveal the appearance and topographical changes in the distribution in the hypophysis of Xenopus laevis tadpole from hatching to the end of metamorphosis. TSH-immunoreactive cells initially appeared at stage 49 (just the beginning of development of the pars nervosa in the hypophysis) as small clusters in the middle part of the pars distalis. They showed conspicuous changes in number during late premetamorphosis: their number reached a peak at stage 51, suddenly decreased at stage 52 (just before completion of the hypophysial histogenesis) followed by gradual increase until the end of metamorphosis. At later stages, they were restricted to the posterior half of the pars distalis.
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