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The methods of enzymatic and chemical treatment of end-labeled RNA were applied to the determination of the nucleotide sequence of chicken and man U1A RNA and to the reexamination of that of rat U1A RNA. The chemical method allowed the easy demonstration of the cap structure. All three RNA were 165 nucleotide long. Two hitherto non described modified pyrimidines were detected close to the 5' end. Only 9 base substitutions were observed from chicken to man indicating high degree of conservation of U1A RNA through evolution.

Nucleotide sequences of nuclear U1A RNAs from chicken, rat and man