Abstract
Plasma immunoreactive substance P (iSP) was measured by radioimmunoassay in 12 paired samples of maternal and cord blood, and in placental extracts. The mean plasma iSP concentration in the cord vein was 42.5 pg/ml, as compared to 77.3 pg/ml in the maternal peripheral vein plasma. There was no difference in the mean iSP concentration in the cord vein and artery. Although no iSP was detected in placental tissue, the placenta could not be excluded as the source of iSP in cord blood in view of the rapid degradation of synthetic SP by the placental in vitro.
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