DOWNSTREAM CONTROL. “When CYC2 is ubiquitously expressed, then RAD is activated throughout the corolla, which inhibits DIV. DIV remains diffusely expressed throughout the corolla, perhaps not sufficiently to result in the up-regulation of AmMYBL1, leading to the loss of trichomes.”
http://onlinelibrary.wiley.com/doi/10.1111/nph.13198/full