The journal Sciencehas formally retracted two discredited studies about embryonic stem cells by South Korean scientist Dr Hwang Woo-suk that it published.
The journal, considered one of the most prestigious scientific publications in the world, said it was putting into place better methods for detecting fraud.
"Because the final report of the SNU [Seoul National University] investigation indicated that a significant amount of the data presented in both papers is fabricated, the editors of Sciencefeel that an immediate and unconditional retraction of both papers is needed," the journal said in a statement.
"We therefore retract these two papers and advise the scientific community that the results reported in them are deemed to be invalid," the journal, published by the American Association for the Advancement of Science, said.
An investigation panel at Seoul National University said on Tuesday that evidence supporting two landmark papers on embryonic stem cells had been faked. But a third, on the first successful cloning of a dog, was valid.
Dr Hwang won global acclaim in 2004 when he reported he had used cloning technology to create human embryos, and then mined them for valuable embryonic stem cells.
He reported last year that he had taken this a step further, creating several tailored batches, or lines, of stem cells from diseased and injured volunteers.
But it emerged this week that Dr Hwang's lab had in fact created parthenotes - human eggs which begin dividing on their own as if they have been fertilised but stop and so are not true embryos.