Obama and McCain weigh in on stem cells, federal research funding, and preventive medicine.

As researchers develop ways of reprogramming adult cells, such as skin cells, to have the same flexibility as embryonic stem cells, this new test shows that the reprogrammed stem cells are truly capable of becoming any cell in the body.

Survivors of the 1918 Spanish flu pandemic still make antibodies against the virus, revealing a long-lived immunity previously thought impossible.

Advances in gene therapy could tempt some athletes to enhance their genetic makeup, leading some researchers to work on detection methods just in case.

Delivering small interfering RNAs, or siRNAs, to human immune cells in mice protects the cells from HIV and suggests future therapy for patients.

Misfolded, clumping proteins evade conviction, but they remain prime suspects in neurodegenerative diseases.

Featured blog: FDA accords some trans fats a "generally regarded as safe" designation.

Finding the shape of a protein that enables the flu virus to replicate points to ways to combat the disease.

Scientists have known for ages that metabolism is tied to the body’s daily rhythms. Two new studies suggest how.

Viagra eases some sexual problems for women taking antidepressants

Skeletal muscle stem cells can fix weakling muscles in mice and could eventually lead to treatments for muscular dystrophy.