|This page duplicates a dictionary definition already listed on Wiktionary. Its dictionary counterpart can be found at Wiktionary:Transwiki:Transplacental, Wiktionary:Transplacental, or Wiktionary:transplacental.
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Transplacental refers to the ability of a toxin or pathogen to cross the physical and biological barriers of the placenta separating the mother and fetus, to whom such substances may be dangerous. This would include, for example, HIV and the drug thalidomide.
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