Abstract
Summary
Portions of human placental tissue have been studied by radioautography utilizing tritiated thymidine. Thymidine uptake could be demonstrated in cytotrophoblast, villous mesenchyme and vascular endothelium but not in the syncytiotrophoblast. This finding suggests that amitotic division of the syncytiotrophoblast does not play a prominent role in the derivation of this cellular layer in the human placenta of 14-18 weeks gestational age.
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