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A Japanese centre which says it has trained a dog to sniff out human cancer cells is cloning the animal in South Korea, a Seoul bio-technology company and the dog's owner said on Wednesday.

Cloned foetuses from the black labrador retriever named Marine were in April implanted into a surrogate mother dog, said Ra Jeong-Chan, president of RNL Bio.

"We are going to see the clones around the end of May," Ra said.

Marine, who is six and half years old, lost her ability to reproduce when she had her womb removed because of disease.