Molecular biology/Biological clocks

Circadian rhythm

More Genes Are Controlled By Biological Clocks Than Previously Thought

http://www.sciencedaily.com/releases/2008/08/080829091327.htm

Clue to Mystery of How Biological Clock Operates on 24-Hour Cycle

http://www.sciencedaily.com/releases/2009/11/091127124849.htm