What makes the cells differ from one another is that different genes in that DNA are either turned on or off in each type of cell. Take a typical cell, such as a red blood cell. Each gene within ...

But female mice, which live longer than males, have different genes associated with longer life spans than male mice. Study coauthor Robert Williams, a geneticist at the University of Tennessee, says ...

In each type of cell, like a muscle cell or a skin cell, different genes are expressed (turned on) or silenced (turned off). If the cells that are turned on mutate, they could—depending on what ...