African and Asian strains of Zika virus differ in their ability to infect and lyse primitive human placental trophoblast.

PLoS One · 2018 · PMC6037361 · PMID 29985932

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This timing may be significant because the mouse hemochorial placenta only begins to develop after embryonic day 8.5 and only approaches structural maturity by day 10.5 [ 52 ].

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