Bougueleret L, Bieth G, Horodniceanu T
J Bacteriol. 1981 Feb;145(2):1102-5. doi: 10.1128/jb.145.2.1102-1105.1981.
Two streptococcal isolates of groups C and G harbored conjugative R plasmids with molecular weights of 17 X 10(6) (pIP646) and 20 X 10(6) (pIP920). These plasmids carried genetic markers for resistance to macrolides and related drugs, as well as to chloramphenicol (pIP920), and have very similar HindIII restriction enzyme patterns.