"One reviewer moved to reject the paper because of its foundation on negative results, he recalls."
"Morrison and colleagues grew individual HSCs on plates, stopping cultures after one or two divisions and probing all the colonies to see whether there were any in which all the newly synthesized chromosomes moved together into new daughter cells. None turned up, but the reviewers pushed Morrison to look for smaller and smaller subsets."
"He says the work was held to a higher standard than usual. "Papers that present evidence in favour of an idea don't show that most stem cells do something, only that some stem cells do something."
Of course as we already know, this scientific Cinderella story has a happy ending. Morrison and his group jumped through all of the reviewers' hoops, the paper was strengthened, and published in the world's greatest scientific journal in the history of the universe. Not to mention a great blow struck on behalf of stem cell atheists everywhere.