URLDate
Verified		Extra Software
Requirements
(if any)		Access
Conditions		Notes
http://www.plantphysiol.org/cgi/reprint/20/4/57303/04/2010PDF Reader
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC437250[...]03/04/2010
http://www.jstor.org/stable/425789503/04/2010PDF ReaderItem is within a limited-access website