A Japanese doctor who helped develop a new transplant method has taught the technique at a hospital in China that has come under international criticism for its use of organs from executed prisoners.
Ko Okumura, an immunology professor at Juntendo University in Tokyo, said Thursday he only cooperated with the hospital in eastern China for its experiments using monkeys.
"I think there are no problems as long as the tests are on animals," said Okumura, a key figure in developing a transplant method that can curb organ rejection without dependence on immune suppressors.