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PreImplantation Factor (PIF9&15) secreted by viable embryos exerts an essential transplant acceptance and immune regulatory role in pregnancy. Synthetic PIF replicates endogenous PIF's effect in pregnant and non-pregnant immune disorder models. PIF binds macrophages to regulate CD3/CD28-induced T-cell response. We present evidence that PIF regulates the co-stimulatory T-cell receptor, CD2, which...
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