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Southern blotting and Northern blotting are two classical molecular biology techniques used for the detection of specific nucleic acids, but they differ in the type of nucleic acid analyzed, their applications, and the overall procedure. Both techniques were developed to study gene expression and genetic information, yet each serves a distinct purpose within genetic engineering and biotechnology. Southern blotting, named after its inventor Edwin Southern, is a method specifically designed for the detection of DNA. In this technique, DNA is first isolated from the organism of interest and then digested with restriction endonucleases to generate fragments of varying lengths. These fragments are separated based on size using agarose gel electrophoresis. Since DNA fragments within the gel cannot be directly probed, they are denatured into single strands and transferred onto a nylon or nitrocellulose _____ ____ ______ ___ _________.
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