BMJ 2007; 335 doi: (Published 20 September 2007) Cite this as: BMJ 2007;335:0-b

Slipping from her usual standard of excellence, Minerva made a sad hash of the second item on her page of the issue of 15 September (BMJ 2007;335:570, doi: 10.1136/bmj.39332.450845.471). For an accurate and comprehensible summary of the work of Hessell et al (Nature 2007;449:101-4), we can do no better than to direct you to Chris Smith's exemplary explanation in his Rapid Response of 18 September (

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