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Transfer RNA and aminoacyl tRNA synthetases in hormone dependent and independent mammary tumors of GR mice: II. Isoacceptor tRNA's in hormone dependent and independent mammary tumors of GR mice.

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The chromatographic elution profiles of 15 aminoacyl tRNA's from dependent and independent mammary tumors of GR mice have been studied using the reversed phase chromatography (RPC 5). The seryl tRNA from the dependent tumor displayed three isoacceptor peaks while only two isoacceptor peaks were observed in the case of the independent tumor when the tRNA's were charged in the presence of the GR mice liver enzyme. Charging of the tRNA's with radioactive leucine by homologous and heterologous enzyme revealed major differences in the leucyl isoacceptor species. The homologous dependent tumor system charges five leucyl tRNA species while the independent system only charges four. The leucyl tRNA from the dependent tumor has a new peak which is only recognized by its own enzyme, but this peak is either suppressed or completely absent in the independent tumor.

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