There are tens of trillions of cells in the human body, and new cells are constantly forming as older cells age and die. But sometimes, cell growth and replication doesn't stop when it should. These ...

Every cell in your body is a small, busy city. It has boundaries, communication networks, recycling systems and manufacturing centers. But every city needs power. Without energy, nothing moves, ...

(CNN) — Here is some background information about stem cells. Scientists believe that stem cell research can be used to treat medical conditions including Parkinson’s disease, spinal cord injury, ...

Some of these facts sound like science fiction. Others feel like glitches in the system. All of them are real. Here are 20 ...

- Stem cells can be manipulated, under certain conditions, to become mature cells with special functions, such as the beating cells of the heart muscle or insulin-producing cells of the pancreas.