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Three plasmids designated alpha, beta, and gamma, distinguishable by their molecular weights (6, 17, and 34 million, respectively) were isolated from Streptococcus faecalis strain DS-5 (ATCC 14508). Derivatives of this strain "cured" for erythromycin resistance lacked the beta-plasmid. In the parent strain the beta-plasmid was estimated to be present to the extent of one to two copies per chromosomal genome equivalent whereas the alpha- and gamma-plasmids were about nine and five copies, respectively.

journal of bacteriology

Characterization of Three Plasmid Deoxyribonucleic Acid Molecules in a Strain of <i>Streptococcus faecalis</i> : Identification of a Plasmid Determining Erythromycin Resistance

Characterization of Three Plasmid Deoxyribonucleic Acid Molecules in a Strain of Streptococcus faecalis : Identification of a Plasmid Determining Erythromycin Resistance