Of the following, the substance that typically CANNOT pass through the placenta to the developing embryo is

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Maternal blood cells are too large to pass through the placenta and enter the fetal circulation. Oxygen, as well as nutrients such as sugars, proteins, and fats can pass through the placenta. However, certain viruses may also be unable to pass through the placenta due to the presence of maternal immune factors that protect the developing fetus.

Of the Following, the Substance That Typically CANNOT Pass Through