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Curr Opin Immunol. 2000 Dec;12(6):731-7.

Tolerance to the foeto-placental 'graft': ten ways to support a child for nine months.

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Institute of Human Histology, University of Liege, 20 Rue de Pitteurs, B-4020 Liege, Belgium.


Tolerance to the foetal 'allograft' has been extensively studied in the past few years, providing interesting new insights. In addition to a potential role for HLA-G, which has been widely discussed, there are hypotheses suggesting roles for several other molecules or cells: leukemia inhibitory factor and its receptor; indoleamine 2. 3-dioxygenase; the Th1/Th2 balance; suppressor macrophages; hormones such as progesterone or the placental growth hormone; CD95 and its ligand; and, as recently proposed, annexin II. Tolerance of the foetal allograft is probably the consequence of a wide panel of mechanisms that may or may not be pregnancy-specific, that are of major or secondary importance and that may be interconnected.

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