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J Clin Endocrinol Metab. 1990 Jul;71(1):15-8.

Identification of placental human growth hormone as the growth hormone-V gene expression product.

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  • 1Experimental and Clinical Endocrinology, CHU B-23, Liege, Belgium.


A GH variant of placental origin, placental GH, has recently been shown to replace pituitary GH in maternal serum during pregnancy. Besides, the GH variant (GH-V) gene has been demonstrated to be expressed in the placenta. The similarities between their known properties strongly suggest that the placental GH and the GH-V protein are the same molecular species. Here we provide final evidence that this is indeed the case by sequence analysis of both the 22K and 25K forms. Furthermore, the 25K form is shown to be glycosylated, while the 22K form is not. Both size variants of placental GH are, thus, likely to reflect the partial glycosylation of a unique peptidic chain.

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