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Schematic illustration of the BH10-LD3, BH10-LD4, and BH10-LD5 deletion mutant constructs, in which DNA sequences at nt positions +238 to +253, +261 to +274, and both +238 to +253 and +261 to +274, respectively, have been deleted. Sequences eliminated in each of the constructs are identified by a dotted line within the secondary structure of the DIS region. PBS, primer binding site; SD, splice donor.
