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Schematic structure of the mutant sites in sch and schl. In the sch mutant a sequence of ∼70 kb was replaced with a ∼4.6-kb mariner-like transposon located between ∼6 kb upstream of the BmTh gene and ∼2 kb upstream of the BmMet2 gene (Middle), whereas the schl mutant had a large insertion in front of the transcription start site of BmTh (Bottom). Red underlines indicate a repeated sequence found in the insertion sequence. Arrows indicate the direction of transcription.
