 During the investigation, accusations of having misspent part of a 5.6 million kroner research grant were also leveled against her, and the University of Copenhagen returned 2 million kroner to the donor.Fifty-eight Danish researchers signed a letter requesting an open review of Penkowa's research, citing suspicions about data fabrication going back to 2002.Penkowa denied any wrongdoing, but resigned her professorship in December 2010.