> Peter says that it is not clearly shown in the paper. Don't take my word for it. The work is available for anyone to read. It was published by PLoS (PUBLIC LIBRARY OF SCIENCE) on February 23, 2011 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3044129 *********************************************** The BEE-L mailing list is powered by L-Soft's renowned LISTSERV(R) list management software. For more information, go to: http://www.lsoft.com/LISTSERV-powered.html Guidelines for posting to BEE-L can be found at: http://honeybeeworld.com/bee-l/guidelines.htm