title: Electron microscopic studies of macromolecules without appositional contrast.
mesh_terms: D000256:Adenoviridae; D003580:Cytochromes; D004247:DNA; D004926:Escherichia coli / Q000166:cytology; D005293:Ferritins; D046911:Macromolecular Substances; D008854:Microscopy, Electron; D012270:Ribosomes; D013154:Spleen / Q000166:cytology
chemical_list: D003580:Cytochromes; D046911:Macromolecular Substances; D004247:DNA; D005293:Ferritins