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The article focuses on the study of stereocilia, a v-shaped battlement situated at the top of sensory cells linked to inner ear. It says that stereocilia are organelles responsible for receiving vibrations that get into the ear through electrical signals that pass through the brain and form a sound. It adds that the National Institute for Deafness and Other Communication Disorders (NIDCD) researchers have discovered a new protein that works with other proteins to control stereocilia length.

Focuses on the biochemical understanding of how cells keep time with clock protein structures from primitive bacteria. Control of daily cycles of gene expression, physiology and behavior; Mechanism of biological clocks in cyanobacteria; Creation of strains with mutant clock proteins.

Cites research at Ariad Pharmaceuticals on a compound that inhibits cell signaling by the Src homology 2 (SH2) protein domain in living cells, published in volume 97 of the `Proceedings of the National Academy of Science.' Design and synthesis of the AP22408 compound; Difficulties in designing SH2 inhibitors with selective in vivo activity; Potential application as a drug for osteoporosis.

Discusses the discovery of the missing link in the explanation of how the circadian clock works in mammals. Factors that primarily regulate the circadian clock; Study on fruit flies; Proteins responsible for the regulation of the circadian clock in mammals.