Emil Theodor Kocher

Seldom in the history of medicine has the recognition of the most effective cure followed as swiftly on the heels of the discovery of a disease as the establishment of the complete effectiveness of iodothyrin and thyroidin followed the recognition of cachexia thyreopriva.

What do cells do when they see a broken piece of DNA? Cells don't like such breaks. They'll do pretty much anything they can to fix things up. If a chromosome is broken, the cells will repair the break using an intact chromosome.