Which probing technique detects DNA immobilized on a membrane using labeled DNA fragments?

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Southern blotting is the probing technique that uses labeled DNA fragments to detect the presence of specific DNA sequences immobilized on a membrane after separation via gel electrophoresis. Northern blotting is similar but is used to detect RNA, while western blotting detects proteins. Polyacrylamide gel electrophoresis in SDS is a technique used for protein separation, and isoelectric focusing separates proteins based on their isoelectric point.

Which Probing Technique Detects DNA Immobilized on a Membrane Using