Researchers work inside a laboratory for experiments related to cloning at the Beijing Genomics Institute in Shenzhen, southern China April 23, 2012. Chinese scientists have cloned a genetically modified sheep containing a "good" type of fat found naturally in nuts, seeds, fish and leafy greens that helps reduce the risk of heart attacks and cardiovascular disease. Picture taken April 23, 2012. REUTERS/Tyrone Siu (CHINA - Tags: HEALTH SCIENCE TECHNOLOGY ANIMALS)