Recombinant DNA
Charged molecules are separated based on varying rates of migration through a solid matrix when subjected to an electric field. This technique is known as

gel electrophoresis
autoradiography
photoreactivation
blotting

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Recombinant DNA
The Southern blotting technique depends on

similarities between the sequences of probe DNA and experimental DNA
the molecular mass of proteins
similarities between the sequences of probe protein and experimental protein
similarities between the sequences of probe RNA and experimental RNA

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