title: Tracer methods in the study of blood-tissue and transplacental exchange. Introduction.
mesh_terms: D000818:Animals; D001783:Blood Flow Velocity; D005260:Female; D007553:Isotope Labeling / Q000379:methods; D008431:Maternal-Fetal Exchange; D010920:Placenta / Q000098:blood supply / Q000502:physiology*; D011247:Pregnancy