Crossing the placenta.
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trans·pla·cen·tal .tran(t)s-plə-'sent-əl adj relating to, involving, or being passage (as of an antibody) between mother and fetus through the placenta <\transplacental immunization>
trans·pla·cen·tal·ly -əl-ē adv
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trans·pla·cen·tal (trans″plə-senґtəl) through the placenta.Medical dictionary. 2011.