Time Flies for Drosophila Audra L Scully, Steve A Kay Cell Volume 100, Issue 3, Pages 297-300 (February 2000) DOI: 10.1016/S0092-8674(00)80665-0
Figure 1 The Circadian Oscillator in Drosophila Depiction of the interlocked feedback loops of the central pacemaker and the clock's response to light. Arrows indicate positive regulation and lines ending in bars denote negative regulation. R, repressor; A, activator; CCRE, circadian clock regulatory element; and ccg, clock controlled gene. Cell 2000 100, 297-300DOI: (10.1016/S0092-8674(00)80665-0)