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. 2020 May 13;223(2):275–278. doi: 10.1016/j.ajog.2020.05.023

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Placental thick section at 1 micron stained with toluidine blue showing the terminal villi containing fetal blood vessels (10×)

This area was used for transmission electron microscopy.

Algarroba. Visualization of SARS-CoV-2 invading the human placenta using electron microscopy. Am J Obstet Gynecol 2020.