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Map of the U3 and R regions of the HIV-1 LTR as they appear in pXLTRCAT. Nucleotide numbers are relative to the transcription start site, +1. Significant known and potential transcriptional control regions are indicated. The Xba I and Hind III sites were used in the construction of the linker scanning mutants. The consecutive positions of the NXS linker scanning mutations are diagrammed under their respective positions in the LTR.
