New studies on a type of inherited breast cancer identify a key factor with different roles in different cancers.

Intestinal stem cells go awry in elderly flies.

Nanoparticles can be designed for targeted delivery of drugs or genes into the body. New work reveals details of how blood proteins respond to these particles.

Draft rules lay out policies for approving altered animals, including those used for food.

An omega-7 fatty acid made by fat and liver cells acts as a hormone, even mimicking the health benefits of insulin. (p. 15)

Yeast cells fed a calorie-restricted diet live longer and have just as much energy as those fed a normal diet.

GOTHENBURG, Sweden —Woody Allen might have coined it: the law of conservation of fragility. If part of a biological network gets stronger, some other part is bound to get weaker, new research shows. Its total fragility never gets better or worse, it just stays the same. Rather than being a statement of pessimism, this new law of conservation offers hope for finding better drug targets to treat diseases such as diabetes, heart disease and cancer, according to research presented by Hans V. Westerhoff, systems biologist at the Manchester Centre for Integrative Systems Biol...

Protein improves old rats’ ability to form new memories.