When bananas are ripe, an enzyme known as tyrosinase causes small and round black dots on their skin which may help to unlock an easier and faster way of diagnosing human skin cancer because the same enzyme is present in human skin as well. It is found in large quantity in the skin of people affected from Melanoma, which is a deadly form of skin cancer. A team of scientists observed this similarity which helped them build a cancer scanner which was proved effective when first tested on banana peels and then on human tissue.