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RNA affinity for L-tryptophan: Affinity elution from tryptophan-Sepharose using (A) [32P]RNA 10Trp, (B) RNA (9:[32P]RNA 10Trp), (C) [32P]RNA 9, (D) ([32P]RNA 9:RNA 10Trp), (E) amino acid selectivity assay by successive elution of affinity-immobilized RNA.
