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Binding of LH and FSH to porcine granulosa cells during follicular maturation

Summary. The uptake of¹²⁵I-labelled LH by equal numbers of granulosa cells from small, medium or large follicles was greater by cells from large follicles. In contrast, granulosa cells obtained from small follicles bound much more¹²⁵I-labelled FSH per cell than did cells obtained from medium and large follicles. Competition studies with unlabelled hormones indicated that porcine granulosa cells have specific receptors for LH and FSH. The addition of diethylstilboestrol enhanced the binding of¹²⁵I-labelled LH and inhibited the binding of¹²⁵I-labelled FSH to granulosa cells harvested from small and medium-sized follicles, but had no effect on those from large follicles.

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