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. 2012 Jul 27;3:262. doi: 10.3389/fmicb.2012.00262

FIGURE 2.

FIGURE 2

Mouse mature placenta. Left: mouse placenta is composed of labyrinth, spongiotrophoblast, and giant cell layers. Right: magnified view of the labyrinth layer. In the labyrinth layers, fetal capillaries are surrounded by three layers of trophoblast cells and are bathed in maternal blood, functioning as a site of nutrient and gas exchange between the fetal and maternal blood.