TO GO WITH AFP STORY BY MARIETTE LE ROUX (FILES) This file photo released on February 24, 1998 in London shows Mr Jefferson, a cloned calf produced by the team which produced Dolly the cloned sheep, standing in his stall at the Virginia and Maryland Regional College of Veterinary Sciences in Blacksburg. When Dolly the cloned sheep was born 20 years ago on July 5, many hailed mankind's new-found mastery over DNA as a harbinger of medical miracles such as lab-grown transplant organs. Others trembled at the portent of a "Brave New World" of identical humans farmed for spare parts or as cannon fodder. As it turns out, neither came to pass. / AFP PHOTO / STRSTR/AFP/Getty Images

This picture taken on June 29, 2016 shows cloned dogs in a glass-fronted pen at a care room of the Sooam Biotech Research Foundation, a world leader in pet cloning, in Seoul. Sooam Biotech clones many animals, including cattle and pigs for medical research and breed preservation, but is best known for its commercial dog service. Since 2006, the facility has cloned nearly 800 dogs, commissioned by owners or state agencies seeking to replicate their best sniffer and rescue dogs. / AFP PHOTO / JUNG YEON-JE / TO GO WITH Science-genetics-cloning-pets-SKorea,FEATURE by Jung Ha-WonJUNG YEON-JE/AFP/Getty Images

This picture taken on June 29, 2016 shows a South Korean reseacher holding a cloned dog in her arms at a care room of the Sooam Biotech Research Foundation, a world leader in pet cloning, in Seoul. Sooam Biotech clones many animals, including cattle and pigs for medical research and breed preservation, but is best known for its commercial dog service. Since 2006, the facility has cloned nearly 800 dogs, commissioned by owners or state agencies seeking to replicate their best sniffer and rescue dogs. / AFP PHOTO / JUNG YEON-JE / TO GO WITH Science-genetics-cloning-pets-SKorea,FEATURE by Jung Ha-WonJUNG YEON-JE/AFP/Getty Images

This picture taken on June 29, 2016 shows South Korean scientist Hwang Woo-Suk during an embryo injection operation on a surrogate mother dog at the Sooam Biotech Research Foundation, a world leader in pet cloning, in Seoul. Sooam Biotech clones many animals, including cattle and pigs for medical research and breed preservation, but is best known for its commercial dog service. Since 2006, the facility has cloned nearly 800 dogs, commissioned by owners or state agencies seeking to replicate their best sniffer and rescue dogs. / AFP PHOTO / JUNG YEON-JE / TO GO WITH Science-genetics-cloning-pets-SKorea,FEATURE by Jung Ha-WonJUNG YEON-JE/AFP/Getty Images

This picture taken on June 29, 2016 shows a South Korean researcher removing a nucleus from a donor egg at the Sooam Biotech Research Foundation, a world leader in pet cloning, in Seoul. Sooam Biotech clones many animals, including cattle and pigs for medical research and breed preservation, but is best known for its commercial dog service. Since 2006, the facility has cloned nearly 800 dogs, commissioned by owners or state agencies seeking to replicate their best sniffer and rescue dogs. / AFP PHOTO / JUNG YEON-JE / TO GO WITH Science-genetics-cloning-pets-SKorea,FEATURE by Jung Ha-WonJUNG YEON-JE/AFP/Getty Images

This picture taken on June 29, 2016 shows South Korean researchers checking donor eggs for dog cloning at the Sooam Biotech Research Foundation, a world leader in pet cloning, in Seoul. Sooam Biotech clones many animals, including cattle and pigs for medical research and breed preservation, but is best known for its commercial dog service. Since 2006, the facility has cloned nearly 800 dogs, commissioned by owners or state agencies seeking to replicate their best sniffer and rescue dogs. / AFP PHOTO / JUNG YEON-JE / TO GO WITH Science-genetics-cloning-pets-SKorea,FEATURE by Jung Ha-WonJUNG YEON-JE/AFP/Getty Images

This picture taken on June 29, 2016 shows a South Korean researcher playing with cloned dogs in the fenced lawn at the Sooam Biotech Research Foundation, a world leader in pet cloning, in Seoul. Sooam Biotech clones many animals, including cattle and pigs for medical research and breed preservation, but is best known for its commercial dog service. Since 2006, the facility has cloned nearly 800 dogs, commissioned by owners or state agencies seeking to replicate their best sniffer and rescue dogs. / AFP PHOTO / JUNG YEON-JE / TO GO WITH Science-genetics-cloning-pets-SKorea,FEATURE by Jung Ha-WonJUNG YEON-JE/AFP/Getty Images

This picture taken on June 29, 2016 shows South Korean researchers carrying a surrogate mother dog after an embryo injection operation at the Sooam Biotech Research Foundation, a world leader in pet cloning, in Seoul. Sooam Biotech clones many animals, including cattle and pigs for medical research and breed preservation, but is best known for its commercial dog service. Since 2006, the facility has cloned nearly 800 dogs, commissioned by owners or state agencies seeking to replicate their best sniffer and rescue dogs. / AFP PHOTO / JUNG YEON-JE / TO GO WITH Science-genetics-cloning-pets-SKorea,FEATURE by Jung Ha-WonJUNG YEON-JE/AFP/Getty Images