An anonymous reader writes: In 2005, researchers in Sweden seemed to settle the question when they announced that messenger RNA from the FT gene was the mobile signal to trigger flowering. But this week, the Swedish team formally retracted this claim. "A guest researcher from China who had been invited to join our team manipulated the data to get false results," says Ove Nilsson at Umeå University in Sweden. The Chinese researcher, Tao Huang, who is no longer at Umeå University, still stands by his results, says Nilsson. This event has raised concerns about the ethical standard of Chinese scientists in Sweden.