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The existence of nuclear tri-iodothyronine (T₃) receptors in both Sertoli and Leydig cells isolated from immature piglet testes was investigated. The results demonstrated the presence of high-affinity (K_d=1·09±0·25 nM), low-capacity (185±24pg T₃/mg DNA) binding sites for T₃ in nuclei from freshly isolated Sertoli cells. No specific binding for T₃ was observed in nuclei isolated from Leydig cells. The localization of specific T₃ receptors, which might mediate the onset of thyroid hormone action, at Sertoli cell level confirms that these cells are a target for thyroid hormone and strongly sustain the role of the thyroid in the regulation of testicular functions during postnatal development.