Which statement about AFP production prenatally is correct?

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Alpha-fetoprotein is a fetal protein made by the developing fetus, primarily by the liver (with some contribution from the yolk sac) during pregnancy. Because the source is fetal tissues, AFP found in maternal blood comes from the fetus crossing into maternal circulation, not from maternal tissues or the placenta as a production site. Placental tissue may be involved in transport, but it is not the main producer of AFP. The adrenal glands don’t synthesize AFP during prenatal life. Therefore, the statement that fetal tissues produce AFP prenatally is the best choice.