Also if they cough or sneeze, the germs should not be transmitted to others. Operation theatres are supposed to be kept absolutely germ free. A lizard's tail is for its protection only. There are efforts to harvest human organs. This includes liver, kidney and even heart.
Skin is the largest organ of a human body.
Skins can be grown externally and grafted these days. It affects the brain of a cow. Its origins are believed to be from cattle feed which contained lamb's infected intestines. It has been noticed in Europe more than a decade ago. These glands secrete tears which keep the eyes moist and free from dust.