RE: Nature Article -- several posters keep citing the Nature article and the link given will not allow access without being a subscriber to Nature.
Before Nature started requiring a subscribing membership, I had somehow run across a link to the original pdf version. The pdf version is still accessible without a membership.
http://www.nature.com/nature/journal...df/442624a.pdf
For those of you who are, or have been posting elsewhere, using the Nature article as an authority, it might be advisable to update to this pdf link which was actually in a much better format than the article, and had better photos.
