One of the defining characteristics of life is the ability to
keep time, which organisms often achieve by using internal
genetic clocks to govern fundamental cellular behavior.
While the gene networks that produce oscillatory expression
signals are typically quite elaborate, certain recurring
network motifs are often found at the core of these biological
clocks. In this lecture, I will describe our recent
experimental and theoretical work on small genetic networks
exhibiting oscillatory behavior. One common motif which may
