Researchers do not know exactly what causes prostate cancer. But they have found some risk factors and are trying to learn just how these factors cause prostate cells to become cancer. On a basic level, prostate cancer is caused by changes in the DNA of a normal prostate cell. DNA is the chemical in our cells that makes up our genes. Our genes control how our cells function.
Barn definition, a building for storing hay, grain, etc., and often for housing livestock. See more.
Another word for barn in Old English was beretun, barley enclosure (from tun enclosure, house), which accounts for the many Barton place names on the English map, and the common surname. Barn door used figuratively for broad target and great size since 1540s.