Incorrect details were found in a table analyzing the DNA of the wolves and their surrogate mother dogs.
Also a mathematical error involving previous attempts to clone domestic dogs made the wolf team's technical progress seem more impressive.
Lee has told the media that both errors were mistakes.
The journal that published the study, Cloning and Stem Cells, promptly removed the research paper from its Web site yesterday.
Editor in chief Ian Wilmut, the embryologist who created Dolly the sheep—the first successfully cloned mammal—confirmed that the paper's authors have asked for corrections to the text.
"The journal will await the outcome of this investigation before deciding upon any action," he said in an email to National Geographic News.
"No other comments will be made until then."
When reached by telephone yesterday, Yang Kuk, head of Seoul National University's Office of Research, said he would not answer any questions until the investigation is completed in three weeks.
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