Somewhat more formally, for a set Ï of properties and relations, a Ï-representation of some structure X is a structure Y that is the image of X under a s homomorphism that preserves Ï. The label representation is sometimes also applied to the homomorphism itself.
Melanoma. This cancer begins in the melanocytes, the cells that provide the skinâs color. Melanoma is one of the deadliest forms of skin cancer because it can spread rapidly inside the body. Approximately one American dies from melanoma every hour.
Melanoma cells can also spread by way of blood vessels to various organs, carrying cancer to the liver, lungs, brain, or other sites. Melanomas tend to grow in stages: Most melanomas tend to be flat at first, and spread across the skin surface as they grow.