title: Letter: Hepatitis-B antigen and tobacco plants.
mesh_terms: D001386:Azides / Q000494:pharmacology; D002951:Citrates / Q000494:pharmacology; D006493:Heparin / Q000494:pharmacology; D006509:Hepatitis B / Q000097:blood*; D006511:Hepatitis B Antigens; D009336:Necrosis; D010935:Plant Diseases; D010947:Plants, Toxic; D012964:Sodium / Q000494:pharmacology; D014026:Nicotiana; D014027:Tobacco Mosaic Virus
chemical_list: D001386:Azides; D002951:Citrates; D006511:Hepatitis B Antigens; D006493:Heparin; D012964:Sodium