Suppressor action of Hl Myb7 on P chs _H1 activation with TFs in various combinations. The combinatorial transient expression assay was performed and equal agrobacterium aliquots were mixed. For suppressor activity an aliquot of A. tumefaciens bearing 35S::HlMyb7 was added to the following combinations: M2, HlMyb2/HlbHLH2/HlWDR1; s-M3, s-HlMyb3/HlbHLH2/HlWDR1; PAP1, AtPAP1/HlbHLH2/HlWDR1(white columns). Black columns, activity levels without HlMyb7. Instead of suppressor, LBA 4404 was added. C - control, infiltration with A. tumefaciens LBA 4404 without plant vector. Bars represent the confidence intervals at level α = 0.05.