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Southern blot analysis of chromosomal DNA from W83 and M1217. (A) Southern blot hybridization with the mgl probe. (B) Southern blot hybridization with the ermF-ermAM cassette probe. Lanes: 1, ClaI-digested W83 chromosomal DNA; 2, ClaI-digested M1217 chromosomal DNA. HindIII-digested λ DNA size markers are indicated to the left.
