Subtractive hybridization screening of leaves from untransformed controls (wild type), AO sense, and AO antisense lines reveals genes that are differentially expressed as a result of modified AO activity. A, Pie chart shows the total array of genes with modified expression in AO transgenic plants. B, Some of the key genes that are up- and down-regulated in AO sense lines. C, Some of the key genes that are up- and down-regulated in AO antisense plants.