During the past year, our understanding of the cellular and molecular processes involved in the generation and control of circadian rhythms has advanced significantly. Progress has been made at the level of the circadian pacemaker mechanism itself, the input pathways that regulate the pacemaker, and the mechanisms by which the pacemaker regulates its various outputs. A common theme underlying all three of these processes is the involvement of transcriptional and translational control. This review is an updated and extended version of a review first published in Current Opinion in Neurobiology 1991, 1:556-561.
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