There do appear to be methodological problems with the research Chapela and his colleague David Quist had published, but this is hardly unprecedented in a scientific journal. All science is, and should be, subject to challenge and disproof. But in this case the pressure on Nature was so severe that its editor did something unparalleled in its 133-year history: last month he published, alongside two papers challenging Quist and Chapela's, a retraction, in which he wrote that their research should never have been published.

So the campaign against the researchers was extraordinarily successful; but who precisely started it? Who are "Mary Murphy" and "Andura Smetacek"?

Both claim to be ordinary citizens, without any corporate links. The Bivings Group says it has "no knowledge of them". "Mary Murphy" uses a hotmail account for posting messages to AgBioWorld. But a message satirising the opponents of biotech, sent by "Mary Murphy" from the same hotmail address to another server two years ago contains the identification bw6.bivwood.com. Bivwood.com is the property of Bivings Woodell, which is part of the Bivings Group. When I wrote to her to ask whether she was employed by Bivings and whether Mary Murphy was her real name, she replied that she had "no ties to industry". But she refused to answer my questions on the grounds that "I can see by your articles that you made your mind up long ago about biotech". The interesting thing about this response is that my message to her did not mention biotechnology. I told her only that I was researching an article about internet lobbying.