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اندام رشدنیافته
In a complementary study, Bennet Allen (1916) found that when he removed or destroyed the thyroid rudiment of early tadpoles, the larvae never metamorphosed but instead grew into giant tadpoles.
For instance, the limb rudiments, which have high levels of both deiodinase II and TRa, can convert Xi into T3 and use it immediately through the TRa receptor.
Thus, during the early stage of metamorphosis, the limb rudiments are able to receive thyroid hormone and use it to initiate leg growth (Becker et al. 1997; Huang et al.
The rudiments of the wings, genital organs, and
An invagination from the ectoderm fuses with the middle sac to form the imaginal rudiment, and only the aboral epidermis is derived from the larval dermis.
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