Internationally renowned stem cell scientists have told the Today programme that they believe important research in their field is being effectively vetoed from being published by a small number of powerful scientists.
Last year, 14 of the world's leading stem cell scientists wrote an open letter to the editors of the major scientific journals saying that they are giving undue prominence to research that is "scientifically flawed".
Sir Mark Walport, director of the Wellcome Trust, considers the accusations.
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