title: On the nature of the pneumococcal activator substance.
mesh_terms: D001412:Bacillus subtilis; D001426:Bacterial Proteins; D002850:Chromatography, Gel; D004269:DNA, Bacterial; D004926:Escherichia coli; D006193:Haemophilus influenzae; D066298:In Vitro Techniques; D046911:Macromolecular Substances; D013291:Streptococcus; D013296:Streptococcus pneumoniae
chemical_list: D001426:Bacterial Proteins; D004269:DNA, Bacterial; D046911:Macromolecular Substances