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Posted by plosntds_team on 06 May 2009 at 19:11 GMT

An enriched version of this article, semantically tagged by David Shotton and colleagues, can be found at http://imageweb.zoo.ox.ac.... You can also read a related article, by Shotton et al., published in PLoS Computational Biology, at http://www.ploscompbiol.o....

No competing interests declared.