title: Letter: Blood-brain barrier in the human fetus.
mesh_terms: D001812:Blood-Brain Barrier; D005260:Female; D005333:Fetus / Q000502:physiology*; D005865:Gestational Age; D006801:Humans; D008431:Maternal-Fetal Exchange; D011247:Pregnancy; D000509:alpha-Fetoproteins / Q000134:cerebrospinal fluid
chemical_list: D000509:alpha-Fetoproteins