Permeability of antipyrine, creatinine, erythropoietin and viability characteristics of perfused placentas used in the studya.

aAll values shown fall within the range of values for previous placental perfusion studies without any experimental interventions [38].bExperiment number (each represents a complete perfusion experiment with different placentas.cMeans±SD are shown for all phases of the experiment. For placenta 4 only one phase is shown.