Which substance typically does not pass through the placenta to the developing embryo?

Name: Which substance typically does not pass through the placenta to the developing embryo?
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Question

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Maternal blood cells typically do not pass through the placenta to the developing embryo. The placenta acts as a barrier that selectively allows substances like oxygen, nutrients (sugars, proteins, and fats), and some viruses to pass from the mother to the fetus, but generally prevents the direct transfer of blood cells.

Which Substance Typically Does Not Pass Through the Placenta to the Developing