The invention provides a DNA sequence comprising a promoter sequence capable of regulating expression of a gene which encodes a limit dextrinase inhibitor protein (LDI), a method of regulating the expression of a gene, a method of modifying the metabolism within the cells of a transgenic plant, provides a method of producing a gene product within the cells of a transgenic plant, an oligonucleotide probe which selectively hybridizes to a DNA sequence, a transgenic plant and a recombinant DNS comprising vector DNA and a DNA sequence as described in any one of (a) to (f) above.
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