Abstract
A method for the preparation of relatively large quantities of sonicated DNA for use in the vast DNA excess hybridization technique is reported. The procedure, applied here to rat liver DNA, involves centrifugation of DNA from sonicated nuclei to equilibrium in a CsCl gradient, RNase and pronase digestion, and phenol extraction. Compared with DNA purified by the Marmur procedure, the product has a lower contamination with protein and RNA, takes about one third the time to prepare, and has better hybridization characteristics.
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