Now there is a new meaning to the term green cat, these cats glow green. Researchers at the Mayo Clinic engineered these cats to help save lives. The green glowing felines are a research model for the study of AIDS. A gene for green fluorescent protein from the jellyfish, Aequorea Victoria, has been inserted into the cats’ DNA and is used as a marker for cells carrying a second gene which confers resistance to the feline version of the AIDS virus, Feline Immunodeficiency Virus (FIV).
WebMD, by Ann Hohenhaus, DVM, DACVIM, 9/22/11