Tokyo, Japan, May 27, 2009--Who knew artificial evolution could be cute? Common marmosets Kel (left) and Kou, pictured at Keio University School of Medicine in an undated photo released May 27, have skin that glows green under UV light (insets).
Born of genetically engineered, glowing parents, the baby monkeys came by their fluorescence "naturally"--the first time artificially introduced genes have been passed from parent to offspring in primates. The advance may raise the specter of genetically engineered lines of other primates, such as humans. (See more glowing animal pictures.)