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A common cis-acting element in the promoter region of many genes expressed during endosperm development of cereal seeds, the prolamine-box or P-box, is only 20bp upstream of the α-class 22-kDa zein gene-specific cis element, the O2-box, which is recognized by the b-ZIP transcription factor, Opaque-2 (O2). The proximity of these two boxes has prompted a study of how two DNA-binding proteins of a different...
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