Schematic of homozygous T-DNA insertion lines. Boxes indicate exons, solid lines indicate introns and 5′ leader sequence, and dashed lines indicate genomic sequence. Insertion sites are indicated by black triangles. The arrows above the insertion indicate the direction of the T-DNA left-border primer sequence used for mapping the insertion sites. The fls1 line is described in Owens et al. . Genes are chalcone synthase (CHS), chalcone isomerase (CHI), flavanone 3 hydroxylase (F3H), flavonoid 3′ hydroxylase (F3′H), flavonol synthase (FLS1), anthocyanidin synthase (ANS), and anthocyanidin reductase (ANR).