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Localization of Tn901 in the narA locus of mutant strain FM6. Genomic DNA from the indicated strain was simultaneously digested with XhoI, BglII, and PvuII and subjected to Southern blot analysis using the 4.7-kb XhoI insert of plasmid pNR1211 as a probe. The positions and sizes (in kilobases) of some standards are indicated to the left.
