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A single cell can repopulate damaged skeletal muscle in mice, say scientists who devised a way to track the cell's fate in living animals. The research is the first to confirm that so-called satellite cells encircling muscle fibers harbor an elusive muscle stem cell.

Manipulating stem cells prior to transplantation may hold the key to overcoming a critical obstacle to using stem cell technology to repair spinal cord injuries, scientists have shown.

If you find yourself lacking in motivation to go for a run or hit the gym, you may want to check your fingers. According to a new study there is a direct correlation between digit length and voluntary exercise.

Newborns can be protected from seasonal flu when their mothers are vaccinated during pregnancy. Researchers observed a 63 percent reduction in proven influenza illness among infants born to vaccinated mothers while the number of serious respiratory illnesses to both mothers and infants dropped by 36 percent. The study is the first to demonstrate that the inactivated influenza vaccine provides protection to both mother and newborn.

Scientists at JILA, a joint institute of the National Institute of Standards and Technology and the University of Colorado at Boulder, have applied their expertise in ultracold atoms and lasers to produce the first high-density gas of ultracold molecules -- two different atoms bonded together -- that are both stable and capable of strong interactions.

Biologists have found that small-bodied rodents with long lifespans have evolved a previously unknown anti-cancer mechanism that appears to be different from any anticancer mechanisms employed by humans or other large mammals.

Immature, or "baby," fat cells lurk in the walls of the blood vessels that nourish fatty tissue, just waiting for excess calories to help them grow into the adult monsters responsible for packing on the extra pounds, researchers at UT Southwestern Medical Center have found in mice.

Studies published in the journal Sexuality Research and Social Policy reveal that abstinence-only-until-marriage sex education programs fail to change sexual behavior in teenagers, provide inaccurate information about condoms and violate human rights principles.

A hormone found at higher levels when the body produces its own "home grown" fat comes with considerable metabolic benefits, according to a new study. The newly discovered signaling molecule is the first example of a lipid-based hormone -- most are made up of proteins -- although the researchers said they expect it will not be the last.

Researchers conducted a study with a racially diverse sample of 2,925 children ages 5 to 16 years that found that the types of violence that abused children were later re-exposed to lead to specific types of psychological problems. Previously abused children who witnessed family violence, such as partner-on-partner abuse or adult-on-child abuse, had more symptoms of depression and anxiety, while those subjected to harsh physical discipline were more aggressive and more frequently broke rules.