Authors:	Brunner M, Simons MJ, Merrow M.
CellNetworks People:	Brunner Michael
Journal:	"Genes Dev. 2008 Jun 1;22(11):1422-6."

A new finding opens up speculation that the molecular mechanism of circadian clocks in Synechococcus elongatus is composed of multiple oscillator systems (Kitayama and colleagues, this issue, pp. 1513-1521), as has been described in many eukaryotic clock model systems. However, an alternative intepretation is that the pacemaker mechanism-as previously suggested-lies primarily in the rate of ATP hydrolysis by the clock protein KaiC.