Comparison of permeability of different layers of the primate placenta to d-arabinose and urea

Abstract
The permeability of the amnion, chorion, and chorioamnion of the rhesus monkey placenta to urea and to d-arabinose has been studied in vitro. The chorion and chorioamnion were found to be less permeable per unit area than the amnion. No change in permeability with gestational age was found in each of the three tissue layers. Comparison with permeability data for the human chorion laeve revealed the permeability of the rhesus chorion to be similar in magnitude. All three tissue layers studied were more permeable to urea than to d-arabinose.

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