Are there any important substances produced by a placenta in addition to hormones?   

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The placenta is the organ that connects the fetus to the uterus and serves as the direct conduit between the mother and the fetus.  The only real chemicals the placenta produces are hormones as you mentioned including progesterone, estrogen, human placental lactogen (hPL), and human chorionic gonodotropin (hCG). ...

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