title: Persistent polioviral infection of the intact amniotic membrane. II. Existence of a mechanical barrier to viral infection.
mesh_terms: D000650:Amnion / Q000166:cytology*; D001609:Beta-Globulins / Q000378:metabolism; D002244:Carbon; D046508:Culture Techniques; D006801:Humans; D010587:Phagocytosis; D017955:Poliovirus / Q000302:isolation & purification*; D014776:Virus Cultivation
chemical_list: D001609:Beta-Globulins; D002244:Carbon