The life-extending effect that some animals get from calorie-restricted diets may depend on signals from the brain. (p. 414)

Artificial genes inserted into cells make RNA molecules that can perform logical computations. (p. 413)

With the help of a molecule from the rabies virus, scientists have for the first time selectively ferried a drug across the blood-brain barrier to treat a neurological disease in mice. (p. 387)

Microscopic, fluorine-packed particles can make small, cancerous growths easier to detect. (p. 398)

RNA snippets of a newly discovered type could be involved in the mechanisms of cancer. (p. 398)

A mutated gene that's overly active in breast cancer cells could offer a new target for cancer drugs. (p. 371)

Insulin-producing cells in the pancreas proliferate by cell division, unlike other body tissues, which regenerate from adult stem cells. (p. 350)

Radiation and chemotherapy can destroy a tumor, but they may also indirectly promote metastasis, the spread of cancerous cells to other organs. (p. 334)

Researchers have discovered a new way that so-called junk DNA could help regulate gene activity. (p. 309)

Scientists have found a master gene that allows tissue-regenerating stem cells to retain their regenerative capacity. (p. 292)

Pregnant women exposed even to moderate amounts of several common air pollutants tend to have babies with low birthweights. (p. 261)

Certain adult stem cells from female mice regenerate better than those from males, indicating that not all stem cells are created equal. (p. 228)

A gene in mice that benefits the father at the mother's expense appears to help offspring of both sexes. (p. 196)