Photo taken on Sept. 15, 2015 shows the cloned, genetically modified cow Niu Niu's cub at the experimentation base of Beijing University of Agriculture in Beijing, capital of China. A cloned, genetically modified cow has given birth to a healthy calf in China, a crucial step toward producing domestic marbled beef. The calf's mother, Niu Niu, is one of two clones born in 2012 with a gene inserted to increase the fat level of their muscle. (Xinhua/Li Wen)