Dolly was cloned from a cell taken from the mammary gland of a six-year-old Finn Dorset sheep and an egg cell taken from a Scottish Blackface sheep. She was. Twenty years ago this week, scientists in Scotland introduced the first mammal cloned from an adult cell: Dolly the sheep. Her legacy carries on. Dolly the Sheep @ The world's most famous sheep. 20 years on from her birth we examine her lasting legacy. Read more. A post-mortem examination showed she had a form of lung cancer called ovine pulmonary adenocarcinoma , also known as Jaagsiekte,  which is a fairly common disease of sheep and is caused by the retrovirus JSRV. However, extensive health screens on Dolly at the time did not find any conditions which could be directly related to premature or accelerated ageing. That breakthrough would be crucial in the years to come. More… Weather CNN Profiles Leadership Pressroom Partner sites iReport Work for CNN. However, researchers used eggs from dogs to host the genetic material in order to bring the cloned animals to term, because it was difficult to obtain this material from gray wolves in the wild, the study said. Story highlights On February 22, , the world learned about Dolly the sheep Scientists have been using insight from Dolly to advance stem cell therapies. At the time, Colman was research director at PPL Therapeutics, which specialized in producing transgenic genetically engineered livestock. This was further exemplified by Dolly's four cloned "sisters," who were recently euthanized because they too began to show symptoms of osteoarthritis. By Stephanie Bucklin, Live Science Contributor February 22, Juni um Stephanie Bucklin, Live Science Contributor Stephanie Bucklin is a contributing writer for Live Science. She mated and produced normal offspring in the normal way, showing that such cloned animals can reproduce. As the first cloned mammal ever to be created from an adult cell, her birth was of huge excitement both to the scientific world and to the wie manikü. Kinship, culture and cloning". This was a major scientific achievement as it demonstrated that the DNA from adult cells, despite having specialised as one particular type of cell, can be used to create an entire organism. This was successfully treated with anti-inflammatory medication, although the cause of the arthritis was never discovered. The group of researchers, with members from Spain, France and Belgium, used cells from preserved samples from a bucardo captured in to produce the cloned animal, according to the study. The pregnancy went without a problem and Dolly was born on 5 July dolly the sheep News — Science and Environment.