Figure 8.

XCT Has Variable Functions in Inhibition and Activation of Downstream Responses, such as Clock Pace, Hypocotyl Elongation, and Leaf Greening.

Open stars represent white light, and closed stars represent red light. XCT protein levels are reduced via a posttranscriptional mechanism 6 h after dawn, either due to direct effects of light (open star) or regulation by the circadian clock (clock symbol). In addition, XCT acts to repress induction of XCT expression in response to light, particularly red light. See text for further details.