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The 5′ region situated downstream the Ty sequences of the Rev 25 and Rev 56 spontaneous revertants were analyzed. The boxed arrowheads indicate Ty LTRs and the direction of the Ty transcription. In the URA2 structure, the nucleotide locations of the beginning and the end of the duplicated region are given, position +1 being the A nucleotide of the ATG initiator codon of the URA2 gene.
