Two-dimensional restriction analysis of the Bacillus subtilis genome: gene purification and ribosomal ribonucleic acid gene organization

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Abstract
With two-dimensional restriction enzyme analysis we have been able to cleave the Bacillus subtilis genome and resolve the resulting deoxyribonucleic acid (DNA) segments into discrete bands on agarose gels. A general procedure for gene purification has been developed by coupling multidimensional restriction analysis with a biological assay for gene detection. The organization of ribosomal ribonucleic acid (rRNA) genes was studied by hybridizing 16S and 23S rRNA probes to the two-dimensional DNA banding patterns.