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Agarose gel (A) and corresponding Southern blot (B) showing the two 16S rDNA copies from Synechococcus sp. strain WH 7803 cloned into pUC19, probed with digoxigenin-labeled 16S rRNA PCR product amplified from the same strain. Lanes: 1, strain WH 7803 genomic DNA; 2 and 3, pUC19 containing a 16S rDNA copy on a 4.0- and 4.6-kb HindIII fragment, respectively.
