title: Isolation of two types of 50S ribosomes from Streptococcus pyogenes.
mesh_terms: D002499:Centrifugation, Density Gradient; D055598:Chemical Phenomena; D002623:Chemistry Techniques, Analytical; D002627:Chemistry, Physical; D011691:Puromycin / Q000494:pharmacology; D012329:RNA, Bacterial / Q000302:isolation & purification; D012270:Ribosomes; D013297:Streptococcus pyogenes / Q000166:cytology* / Q000187:drug effects
chemical_list: D012329:RNA, Bacterial; D011691:Puromycin