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Fig. S1 Promoter activity of proanthocyanidin (PA) biosynthetic genes that are not directly regulated by the TTG1-dependent complexes in Arabidopsis thaliana seed.

Fig. S2 Promoter activity of proanthocyanidin (PA) biosynthetic genes in 10-d-old seedlings in wild-type (WT), tt2, tt8 and ttg1 Arabidopsis thaliana mutant backgrounds.

Fig. S3 Promoter activity of proanthocyanidin (PA) biosynthetic genes in 5-wk-old wild-type (WT) Arabidopsis thaliana plants.

Fig. S4 Activity of DFR, LDOX and TT19 promoters in 10-d-old wild-type (WT) Arabidopsis thaliana seedlings.

Fig. S5 R2R3-MYB and R/B-like bHLH cis-regulatory elements identified in the Arabidopsis thaliana minimal ‘late biosynthetic gene’ (‘LBG’) promoters.

Fig. S6 Steady-state mRNA level of the MBW genes in developing Arabidopsis thaliana seeds.

Fig. S7 Steady-state mRNA level of the structural genes involved in proanthocyanidin (PA) biosynthesis and directly regulated by the different MBW complexes in developing Arabidopsis thaliana seeds.

Table S1 Primers used in this study

Table S2 Summary of the R2R3-MYB and R/B-like bHLH cis-regulatory elements identified in the Arabidopsis thaliana minimal ‘late biosynthetic gene’ (‘LBG’) promoters