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. 2009 Nov 12;118(3):432–436. doi: 10.1289/ehp.0901200

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Size-dependent barrier capacity of the placental tissue. The ratios between fetal (F) and maternal (M) concentrations of ¹⁴C-antipyrine (open bars) and PS beads (blue bars) were calculated after 180 min of perfusion. The ¹⁴C-antipyrine values remain unchanged, whereas the perfusion rate of the beads showed size dependence. Data represent mean ± SE of at least four independent experiments.

*p < 0.05 compared with 240-nm ratio value; **p < 0.05 compared with 80-nm ratio value; ^#p < 0.05 compared with 50-nm ratio value.