I recently find an article about that subject at the following address :
http://fr.news.yahoo.com/030515/202/373hx.html , but that's in french.
It relates to an article from the british NATURE magazine, mid may, 2003.

I have tried to browse their web site (www.nature.com) but did not found it.

I have found these other related news :

http://www.nature.com/nsu/011129/011129-12.html

http://www.nature.com/nsu/020225/020225-2.html

Hope it helps...

Alain