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Genome structure of the opr3 locus. The T-DNA (not to scale) with an additional 15 bp adjacent to the left border is inserted into a Tnat1 sequence (shaded), which is part of an intron in the OPR3 gene of ecotype WS. The four exons of OPR3 are shown, as are the BamHI sites used for plasmid recovery. The structure of the remainder of the T-DNA insert was not determined. The Col-O allele of OPR3 is shown for comparison.
