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Here we describe the many applications of acid urea polyacrylamide gel electrophoresis (acid urea PAGE) followed by Northern blot analysis to studies of tRNAs and aminoacyl-tRNA synthetases. Acid urea PAGE allows the electrophoretic separation of different forms of a tRNA, discriminated by changes in bulk, charge, and/or conformation that are brought about by aminoacylation, formylation, or modification...
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