A study released at the end of last year ranks UK scientists on the basis of research paper citations. The study by data research company Evidence Ltd, shows that Salvador Moncada (image), of University College London, is the most highly cited biomedical scientist in the UK. Moncada was controversially passed over for the Nobel Prize some years ago when the work that he pioneered on nitric oxide in cardiovascular function was the basis of the award. The citation results, released in the run up to the 2001 Research Assessment Exercise in the UK, also show, perhaps unsurprisingly, that the most highly cited work comes from clustered locations: University College London, Cambridge, Oxford and Dundee. Many of the top 20 on the list, which was published in the UK newspaper The Guardian, are involved in the field of cell signaling. The top 10 are: Salvador Moncada (UCL), Richard Palmer (Alizyme Therapeutics), Sir Michael Berridge (Babraham Institute, Cambridge), Robin Irvine (Cambridge), Michael Waterfield (UCL), Sir Philip Cohen (Dundee), Sir David Lane (Dundee), Barry Halliwell (King's College London), David Mason (Oxford) and Martin Raff (UCL). D.S.