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A, Structure of the DWF4/SNP2 gene. White and black arrows indicate mutation position of dwf4-101 and T-DNA insertion position of dwf4-102, respectively. The DWF4 coding sequence (1,542 bp) consists of eight exons (black rectangles). White rectangles are untranslated regions. B, Structure of the DWF4 protein (Choe et al., 1998). White arrow indicates amino acid substitution position in dwf4-101.
