Professor Harry Moore, of the Centre for Stem Cell Biology at the University of Sheffield, UK, said there were a number of key differences between mice and human testes cells.
John Bennet, a professor of Aegean archaeology at Sheffield University, UK, commented that any new discovery of a channel should be viewed in a wider context.
BBC: NEWS | Science/Nature | Drill hole begins Homeric quest
Professor Robert Coleman, of Weston Park Hospital, Sheffield, one of the UK doctors who took part in the trial, said the results were important and potentially life-saving.
Kieran Kelly set a new Irish indoor shot putt record with a throw of 18.84m and will hope to achieve the European Indoor standard (19.00m) at next weekend's UK Championships in Sheffield.
There are ones dotted over the UK in Manchester, Sheffield, Bath and Glasgow for example but, while these facilities are truly excellent, they are too few and far between.
Lewis-Francis will then compete in the UK indoor trials in Sheffield on 12-13 February as he looks to secure a place in the team for the European indoor championships in Paris in March, where Dwain Chambers will be looking to defend the 60m title he won two years ago in Turin.
Serco is creating more jobs at UK contact centres, including in Cardiff and Sheffield, and moving some work to South Africa and India.
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But matters outside the ropes got so bad UK Sport was forced to take emergency control of the Sheffield-based elite programme in late June.
The Changing UK research was carried out by a team from the University of Sheffield.
Mr O'Dwyer, a Sheffield Hallam University student, previously said he was "surprised" when police officers from the UK and US seized equipment at his home in South Yorkshire in November 2010.
The plan is to extend Crisis Fareshare centre to ten more locations across the UK by the millennium, and franchise operations are already currently underway in Manchester, Huddersfield, Southampton, Sheffield, Birmingham and Wolverhampton.
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