Figure 2: Gene structure of the KAS, SAD, FAD3, KCS, FAT (A) and FAD2 (B) gene families identified from flax cv. CDC Bethune. Green boxes represent exons. Solid black lines between green boxes represent introns and dashed blue lines represent intergenic regions in the case of the intronless FAD2 gene family except for FAD2e-2 which had three exons and two introns. Pairs of duplicated genes are presented where the top one represents copy 1 and the bottom one represents copy 2 in Tables 1, 2, 5 and 6; for example, mtKAS-1 and mtKAS-2. Some genes have a third copy such as KCS3. Gene structure was drawn using Gene Structure Display Server v2.0 (http://gsds.cbi.pku.edu.cn/). IGR: intergenic region.